72687664 has 20 divisors (see below), whose sum is σ = 160951504. Its totient is φ = 31151808.

The previous prime is 72687649. The next prime is 72687683. The reversal of 72687664 is 46678627.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324387 + ... + 324610.

Almost surely, 2^72687664 is an apocalyptic number.

It is an amenable number.

72687664 is an abundant number, since it is smaller than the sum of its proper divisors (88263840).

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

72687664 is a wasteful number, since it uses less digits than its factorization.

72687664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649012 (or 649006 counting only the distinct ones).

The product of its digits is 677376, while the sum is 46.

The square root of 72687664 is about 8525.7060704671. The cubic root of 72687664 is about 417.3370136034.

The spelling of 72687664 in words is "seventy-two million, six hundred eighty-seven thousand, six hundred sixty-four".