72656987 has 8 divisors (see below), whose sum is σ = 78711360. Its totient is φ = 67065960.

The previous prime is 72656869. The next prime is 72656989. The reversal of 72656987 is 78965627.

It is not a de Polignac number, because 72656987 - 2²² = 68462683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72656989) 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, 14339 + ... + 18732.

It is an arithmetic number, because the mean of its divisors is an integer number (9838920).

Almost surely, 2^72656987 is an apocalyptic number.

72656987 is a deficient number, since it is larger than the sum of its proper divisors (6054373).

72656987 is an equidigital number, since it uses as much as digits as its factorization.

72656987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33110 (or 33084 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 50.

The square root of 72656987 is about 8523.9067920760. The cubic root of 72656987 is about 417.2782945656.

The spelling of 72656987 in words is "seventy-two million, six hundred fifty-six thousand, nine hundred eighty-seven".