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81428050270 = 25717611318563
BaseRepresentation
bin100101111010101111…
…1010111000101011110
321210011212020112200201
41023311133113011132
52313231040102040
6101224005414114
75611602002320
oct1136537270536
9253155215621
1081428050270
1131596014416
121394610a33a
1378a8c54c88
143d266ad610
1521b8a54a9a
hex12f57d715e

81428050270 has 128 divisors (see below), whose sum is σ = 181667515392. Its totient is φ = 25644902400.

The previous prime is 81428050259. The next prime is 81428050273. The reversal of 81428050270 is 7205082418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81428050273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9505009 + ... + 9513571.

It is an arithmetic number, because the mean of its divisors is an integer number (1419277464).

Almost surely, 281428050270 is an apocalyptic number.

81428050270 is an abundant number, since it is smaller than the sum of its proper divisors (100239465122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81428050270 is a wasteful number, since it uses less digits than its factorization.

81428050270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8786.

The product of its (nonzero) digits is 35840, while the sum is 37.

The spelling of 81428050270 in words is "eighty-one billion, four hundred twenty-eight million, fifty thousand, two hundred seventy".

Divisors: 1 2 5 7 10 14 17 34 35 61 70 85 119 122 131 170 238 262 305 427 595 610 655 854 917 1037 1190 1310 1834 2074 2135 2227 4270 4454 4585 5185 7259 7991 8563 9170 10370 11135 14518 15589 15982 17126 22270 31178 36295 39955 42815 55937 59941 72590 77945 79910 85630 111874 119882 135847 145571 155890 271694 279685 291142 299705 522343 559370 599410 679235 727855 950929 1018997 1044686 1121753 1358470 1455710 1901858 2037994 2243506 2611715 3656401 4754645 5094985 5223430 5608765 7312802 7852271 8879831 9509290 10189970 11217530 15704542 17759662 18282005 19069801 36564010 38139602 39261355 44399155 62158817 68426933 78522710 88798310 95349005 124317634 133488607 136853866 190698010 266977214 310794085 342134665 478988531 621588170 667443035 684269330 957977062 1163257861 1334886070 2326515722 2394942655 4789885310 5816289305 8142805027 11632578610 16285610054 40714025135 81428050270