161856072 has 48 divisors (see below), whose sum is σ = 500984640. Its totient is φ = 46244448.

The previous prime is 161856049. The next prime is 161856089. The reversal of 161856072 is 270658161.

161856072 is a `hidden beast` number, since 16 + 18 + 560 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160068 + ... + 161075.

It is an arithmetic number, because the mean of its divisors is an integer number (10437180).

Almost surely, 2^161856072 is an apocalyptic number.

161856072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161856072 is an abundant number, since it is smaller than the sum of its proper divisors (339128568).

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

161856072 is a wasteful number, since it uses less digits than its factorization.

161856072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321162 (or 321155 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 161856072 is about 12722.2667791554. The cubic root of 161856072 is about 544.9746889460.

The spelling of 161856072 in words is "one hundred sixty-one million, eight hundred fifty-six thousand, seventy-two".