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18291819282 = 2311277148777
BaseRepresentation
bin10001000010010001…
…110000001100010010
31202012210021200211020
4101002101300030102
5244430201204112
612223025100310
71215200620122
oct210221601422
952183250736
1018291819282
117837289620
123665a87696
131956825909
14c574b0c82
15720ced48c
hex442470312

18291819282 has 16 divisors (see below), whose sum is σ = 39909424032. Its totient is φ = 5542975520.

The previous prime is 18291819277. The next prime is 18291819283. The reversal of 18291819282 is 28291819281.

It is not an unprimeable number, because it can be changed into a prime (18291819283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138574323 + ... + 138574454.

It is an arithmetic number, because the mean of its divisors is an integer number (2494339002).

Almost surely, 218291819282 is an apocalyptic number.

18291819282 is an abundant number, since it is smaller than the sum of its proper divisors (21617604750).

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

18291819282 is a wasteful number, since it uses less digits than its factorization.

18291819282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277148793.

The product of its digits is 331776, while the sum is 51.

Subtracting 18291819282 from its reverse (28291819281), we obtain a palindrome (9999999999).

The spelling of 18291819282 in words is "eighteen billion, two hundred ninety-one million, eight hundred nineteen thousand, two hundred eighty-two".

Divisors: 1 2 3 6 11 22 33 66 277148777 554297554 831446331 1662892662 3048636547 6097273094 9145909641 18291819282