72656664 has 16 divisors (see below), whose sum is σ = 181641720. Its totient is φ = 24218880.

The previous prime is 72656659. The next prime is 72656669. The reversal of 72656664 is 46665627.

It is an interprime number because it is at equal distance from previous prime (72656659) and next prime (72656669).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72656669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1513657 + ... + 1513704.

Almost surely, 2^72656664 is an apocalyptic number.

It is an amenable number.

72656664 is an abundant number, since it is smaller than the sum of its proper divisors (108985056).

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

72656664 is a wasteful number, since it uses less digits than its factorization.

72656664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3027370 (or 3027366 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The square root of 72656664 is about 8523.8878453438. The cubic root of 72656664 is about 417.2776762214.

The spelling of 72656664 in words is "seventy-two million, six hundred fifty-six thousand, six hundred sixty-four".