72915687 has 32 divisors (see below), whose sum is σ = 116894400. Its totient is φ = 44654976.

The previous prime is 72915677. The next prime is 72915691. The reversal of 72915687 is 78651927.

It is not a de Polignac number, because 72915687 - 2¹⁵ = 72882919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72915617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102489 + ... + 103197.

It is an arithmetic number, because the mean of its divisors is an integer number (3652950).

Almost surely, 2^72915687 is an apocalyptic number.

72915687 is a deficient number, since it is larger than the sum of its proper divisors (43978713).

72915687 is a wasteful number, since it uses less digits than its factorization.

72915687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 1018 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 72915687 is about 8539.0682747007. The cubic root of 72915687 is about 417.7729569107.

The spelling of 72915687 in words is "seventy-two million, nine hundred fifteen thousand, six hundred eighty-seven".