72664136 has 16 divisors (see below), whose sum is σ = 139568940. Its totient is φ = 35445760.

The previous prime is 72664133. The next prime is 72664157. The reversal of 72664136 is 63146627.

It can be written as a sum of positive squares in 2 ways, for example, as 72420100 + 244036 = 8510^2 + 494^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72664096 and 72664105.

It is not an unprimeable number, because it can be changed into a prime (72664133) 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, 110441 + ... + 111096.

Almost surely, 2^72664136 is an apocalyptic number.

It is an amenable number.

72664136 is a deficient number, since it is larger than the sum of its proper divisors (66904804).

72664136 is a wasteful number, since it uses less digits than its factorization.

72664136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221584 (or 221580 counting only the distinct ones).

The product of its digits is 36288, while the sum is 35.

The square root of 72664136 is about 8524.3261317244. The cubic root of 72664136 is about 417.2919799881.

The spelling of 72664136 in words is "seventy-two million, six hundred sixty-four thousand, one hundred thirty-six".