72157232 has 20 divisors (see below), whose sum is σ = 159776976. Its totient is φ = 30924480.

The previous prime is 72157199. The next prime is 72157271. The reversal of 72157232 is 23275127.

It is a super-2 number, since 2×72157232² = 10413332259803648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72157195 and 72157204.

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, 322019 + ... + 322242.

Almost surely, 2^72157232 is an apocalyptic number.

It is an amenable number.

72157232 is an abundant number, since it is smaller than the sum of its proper divisors (87619744).

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

72157232 is a wasteful number, since it uses less digits than its factorization.

72157232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644276 (or 644270 counting only the distinct ones).

The product of its digits is 5880, while the sum is 29.

The square root of 72157232 is about 8494.5413060388. The cubic root of 72157232 is about 416.3193738286.

The spelling of 72157232 in words is "seventy-two million, one hundred fifty-seven thousand, two hundred thirty-two".