72865684 has 18 divisors (see below), whose sum is σ = 134582154. Its totient is φ = 34514640.

The previous prime is 72865669. The next prime is 72865687. The reversal of 72865684 is 48656827.

72865684 = T₃₇ + T₃₈ + ... + T₇₅₈.

It can be written as a sum of positive squares in only one way, i.e., 69255684 + 3610000 = 8322^2 + 1900^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72865687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23787 + ... + 26674.

Almost surely, 2^72865684 is an apocalyptic number.

It is an amenable number.

72865684 is a deficient number, since it is larger than the sum of its proper divisors (61716470).

72865684 is a wasteful number, since it uses less digits than its factorization.

72865684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50503 (or 50482 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 72865684 is about 8536.1398770170. The cubic root of 72865684 is about 417.6774370986.

The spelling of 72865684 in words is "seventy-two million, eight hundred sixty-five thousand, six hundred eighty-four".