72664839 has 24 divisors (see below), whose sum is σ = 113454432. Its totient is φ = 44550720.

The previous prime is 72664799. The next prime is 72664841. The reversal of 72664839 is 93846627.

It is not a de Polignac number, because 72664839 - 2⁸ = 72664583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72664794 and 72664803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72664859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35389 + ... + 37385.

It is an arithmetic number, because the mean of its divisors is an integer number (4727268).

Almost surely, 2^72664839 is an apocalyptic number.

72664839 is a deficient number, since it is larger than the sum of its proper divisors (40789593).

72664839 is a wasteful number, since it uses less digits than its factorization.

72664839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327 (or 2324 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 72664839 is about 8524.3673665557. The cubic root of 72664839 is about 417.2933257016.

The spelling of 72664839 in words is "seventy-two million, six hundred sixty-four thousand, eight hundred thirty-nine".