72910657 has 4 divisors (see below), whose sum is σ = 76748080. Its totient is φ = 69073236.

The previous prime is 72910633. The next prime is 72910661. The reversal of 72910657 is 75601927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75601927 = 29 ⋅2606963.

It is a cyclic number.

It is not a de Polignac number, because 72910657 - 2²³ = 64522049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72910627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1918683 + ... + 1918720.

It is an arithmetic number, because the mean of its divisors is an integer number (19187020).

Almost surely, 2^72910657 is an apocalyptic number.

It is an amenable number.

72910657 is a deficient number, since it is larger than the sum of its proper divisors (3837423).

72910657 is a wasteful number, since it uses less digits than its factorization.

72910657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3837422.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 72910657 is about 8538.7737410005. The cubic root of 72910657 is about 417.7633501700.

The spelling of 72910657 in words is "seventy-two million, nine hundred ten thousand, six hundred fifty-seven".