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161227770 = 235111273847
BaseRepresentation
bin10011001110000…
…10001111111010
3102020101012220220
421213002033322
5312233242040
623555400510
73665261544
oct1147021772
9366335826
10161227770
11830108a0
1245bb3136
1327530562
14175ac694
15e24b2d0
hex99c23fa

161227770 has 64 divisors (see below), whose sum is σ = 425558016. Its totient is φ = 38767680.

The previous prime is 161227751. The next prime is 161227777. The reversal of 161227770 is 77722161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a cake number, because a cake can be divided into 161227770 parts by 989 planar cuts.

It is not an unprimeable number, because it can be changed into a prime (161227777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39987 + ... + 43833.

It is an arithmetic number, because the mean of its divisors is an integer number (6649344).

Almost surely, 2161227770 is an apocalyptic number.

161227770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161227770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212779008).

161227770 is an abundant number, since it is smaller than the sum of its proper divisors (264330246).

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

161227770 is a wasteful number, since it uses less digits than its factorization.

161227770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3995.

The product of its (nonzero) digits is 8232, while the sum is 33.

The square root of 161227770 is about 12697.5497636355. The cubic root of 161227770 is about 544.2686033866.

The spelling of 161227770 in words is "one hundred sixty-one million, two hundred twenty-seven thousand, seven hundred seventy".

Divisors: 1 2 3 5 6 10 11 15 22 30 33 55 66 110 127 165 254 330 381 635 762 1270 1397 1905 2794 3810 3847 4191 6985 7694 8382 11541 13970 19235 20955 23082 38470 41910 42317 57705 84634 115410 126951 211585 253902 423170 488569 634755 977138 1269510 1465707 2442845 2931414 4885690 5374259 7328535 10748518 14657070 16122777 26871295 32245554 53742590 80613885 161227770