72531865 has 16 divisors (see below), whose sum is σ = 99929088. Its totient is φ = 49507776.

The previous prime is 72531863. The next prime is 72531869. The reversal of 72531865 is 56813527.

It is a cyclic number.

It is not a de Polignac number, because 72531865 - 2¹ = 72531863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72531863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3159 + ... + 12451.

It is an arithmetic number, because the mean of its divisors is an integer number (6245568).

Almost surely, 2^72531865 is an apocalyptic number.

It is an amenable number.

72531865 is a deficient number, since it is larger than the sum of its proper divisors (27397223).

72531865 is a wasteful number, since it uses less digits than its factorization.

72531865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9528.

The product of its digits is 50400, while the sum is 37.

The square root of 72531865 is about 8516.5641546342. The cubic root of 72531865 is about 417.0386264292.

The spelling of 72531865 in words is "seventy-two million, five hundred thirty-one thousand, eight hundred sixty-five".