161596872 has 24 divisors (see below), whose sum is σ = 437658390. Its totient is φ = 53865600.

The previous prime is 161596861. The next prime is 161596879. The reversal of 161596872 is 278695161.

It can be written as a sum of positive squares in only one way, i.e., 152917956 + 8678916 = 12366^2 + 2946^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×161596872² = 52227098080368768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161596879) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1122129 + ... + 1122272.

Almost surely, 2^161596872 is an apocalyptic number.

161596872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161596872 is an abundant number, since it is smaller than the sum of its proper divisors (276061518).

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

161596872 is a wasteful number, since it uses less digits than its factorization.

161596872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244413 (or 2244406 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 161596872 is about 12712.0758336316. The cubic root of 161596872 is about 544.6836218906.

The spelling of 161596872 in words is "one hundred sixty-one million, five hundred ninety-six thousand, eight hundred seventy-two".