72650639 has 12 divisors (see below), whose sum is σ = 79503552. Its totient is φ = 66156480.

The previous prime is 72650621. The next prime is 72650657. The reversal of 72650639 is 93605627.

It is an interprime number because it is at equal distance from previous prime (72650621) and next prime (72650657).

It is a de Polignac number, because none of the positive numbers 2^k-72650639 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 (72650609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14114 + ... + 18560.

It is an arithmetic number, because the mean of its divisors is an integer number (6625296).

Almost surely, 2^72650639 is an apocalyptic number.

72650639 is a deficient number, since it is larger than the sum of its proper divisors (6852913).

72650639 is a wasteful number, since it uses less digits than its factorization.

72650639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4526 (or 4495 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 72650639 is about 8523.5344194765. The cubic root of 72650639 is about 417.2661417552.

The spelling of 72650639 in words is "seventy-two million, six hundred fifty thousand, six hundred thirty-nine".