72917668 has 18 divisors (see below), whose sum is σ = 134678166. Its totient is φ = 34539264.

The previous prime is 72917653. The next prime is 72917671. The reversal of 72917668 is 86671927.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 48888064 + 24029604 = 6992^2 + 4902^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23805 + ... + 26692.

Almost surely, 2^72917668 is an apocalyptic number.

It is an amenable number.

72917668 is a deficient number, since it is larger than the sum of its proper divisors (61760498).

72917668 is a wasteful number, since it uses less digits than its factorization.

72917668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50539 (or 50518 counting only the distinct ones).

The product of its digits is 254016, while the sum is 46.

The square root of 72917668 is about 8539.1842701748. The cubic root of 72917668 is about 417.7767402792.

The spelling of 72917668 in words is "seventy-two million, nine hundred seventeen thousand, six hundred sixty-eight".