72765657 has 6 divisors (see below), whose sum is σ = 105105962. Its totient is φ = 48510432.

The previous prime is 72765607. The next prime is 72765673. The reversal of 72765657 is 75656727.

It can be written as a sum of positive squares in only one way, i.e., 52838361 + 19927296 = 7269^2 + 4464^2 .

It is not a de Polignac number, because 72765657 - 2¹¹ = 72763609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72765607) 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, 4042528 + ... + 4042545.

Almost surely, 2^72765657 is an apocalyptic number.

It is an amenable number.

72765657 is a deficient number, since it is larger than the sum of its proper divisors (32340305).

72765657 is a wasteful number, since it uses less digits than its factorization.

72765657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8085079 (or 8085076 counting only the distinct ones).

The product of its digits is 617400, while the sum is 45.

The square root of 72765657 is about 8530.2788348330. The cubic root of 72765657 is about 417.4862261343.

The spelling of 72765657 in words is "seventy-two million, seven hundred sixty-five thousand, six hundred fifty-seven".