72656957 has 4 divisors (see below), whose sum is σ = 72709440. Its totient is φ = 72604476.

The previous prime is 72656869. The next prime is 72656989. The reversal of 72656957 is 75965627.

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: 75965627 = 59 ⋅1287553.

It is a cyclic number.

It is not a de Polignac number, because 72656957 - 2¹⁴ = 72640573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72656257) 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, 24107 + ... + 26952.

It is an arithmetic number, because the mean of its divisors is an integer number (18177360).

Almost surely, 2^72656957 is an apocalyptic number.

It is an amenable number.

72656957 is a deficient number, since it is larger than the sum of its proper divisors (52483).

72656957 is a wasteful number, since it uses less digits than its factorization.

72656957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52482.

The product of its digits is 793800, while the sum is 47.

The square root of 72656957 is about 8523.9050323194. The cubic root of 72656957 is about 417.2782371344.

The spelling of 72656957 in words is "seventy-two million, six hundred fifty-six thousand, nine hundred fifty-seven".