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161228960 = 2551007681
BaseRepresentation
bin10011001110000…
…10100010100000
3102020101021112222
421213002202200
5312233311320
623555410212
73665265164
oct1147024240
9366337488
10161228960
1183011782
1245bb3968
1327530c69
14175acca4
15e24b825
hex99c28a0

161228960 has 24 divisors (see below), whose sum is σ = 380903796. Its totient is φ = 64491520.

The previous prime is 161228959. The next prime is 161228983. The reversal of 161228960 is 69822161.

It can be written as a sum of positive squares in 2 ways, for example, as 157051024 + 4177936 = 12532^2 + 2044^2 .

It is a super-3 number, since 3×1612289603 (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161228960.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503681 + ... + 504000.

Almost surely, 2161228960 is an apocalyptic number.

161228960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161228960 is an abundant number, since it is smaller than the sum of its proper divisors (219674836).

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

161228960 is a wasteful number, since it uses less digits than its factorization.

161228960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007696 (or 1007688 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 161228960 is about 12697.5966229834. The cubic root of 161228960 is about 544.2699424405.

The spelling of 161228960 in words is "one hundred sixty-one million, two hundred twenty-eight thousand, nine hundred sixty".

Divisors: 1 2 4 5 8 10 16 20 32 40 80 160 1007681 2015362 4030724 5038405 8061448 10076810 16122896 20153620 32245792 40307240 80614480 161228960