72656320 has 56 divisors (see below), whose sum is σ = 188750448. Its totient is φ = 26419200.

The previous prime is 72656267. The next prime is 72656329. The reversal of 72656320 is 2365627.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72656329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6801 + ... + 13840.

Almost surely, 2^72656320 is an apocalyptic number.

It is an amenable number.

72656320 is an abundant number, since it is smaller than the sum of its proper divisors (116094128).

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

72656320 is a wasteful number, since it uses less digits than its factorization.

72656320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20669 (or 20659 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 72656320 is about 8523.8676667344. The cubic root of 72656320 is about 417.2770176732.

The spelling of 72656320 in words is "seventy-two million, six hundred fifty-six thousand, three hundred twenty".