156720172 has 12 divisors (see below), whose sum is σ = 313440400. Its totient is φ = 67165776.

The previous prime is 156720149. The next prime is 156720173. The reversal of 156720172 is 271027651.

156720172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

156720172 is an admirable number.

It is a super-2 number, since 2×156720172² = 49122424623419168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156720173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2798547 + ... + 2798602.

Almost surely, 2^156720172 is an apocalyptic number.

It is an amenable number.

156720172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

156720172 is a wasteful number, since it uses less digits than its factorization.

156720172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5597160 (or 5597158 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 156720172 is about 12518.7927532969. The cubic root of 156720172 is about 539.1483741263.

The spelling of 156720172 in words is "one hundred fifty-six million, seven hundred twenty thousand, one hundred seventy-two".