72637565 has 64 divisors (see below), whose sum is σ = 122314752. Its totient is φ = 39916800.

The previous prime is 72637561. The next prime is 72637571. The reversal of 72637565 is 56573627.

It is not a de Polignac number, because 72637565 - 2² = 72637561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72637561) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114800 + ... + 115430.

It is an arithmetic number, because the mean of its divisors is an integer number (1911168).

Almost surely, 2^72637565 is an apocalyptic number.

It is an amenable number.

72637565 is a deficient number, since it is larger than the sum of its proper divisors (49677187).

72637565 is a wasteful number, since it uses less digits than its factorization.

72637565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690.

The product of its digits is 264600, while the sum is 41.

The square root of 72637565 is about 8522.7674496023. The cubic root of 72637565 is about 417.2411102488.

The spelling of 72637565 in words is "seventy-two million, six hundred thirty-seven thousand, five hundred sixty-five".