72664736 has 12 divisors (see below), whose sum is σ = 143058762. Its totient is φ = 36332352.

The previous prime is 72664727. The next prime is 72664747. The reversal of 72664736 is 63746627.

It can be written as a sum of positive squares in only one way, i.e., 72250000 + 414736 = 8500^2 + 644^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72664693 and 72664702.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1135355 + ... + 1135418.

Almost surely, 2^72664736 is an apocalyptic number.

It is an amenable number.

72664736 is a deficient number, since it is larger than the sum of its proper divisors (70394026).

72664736 is a wasteful number, since it uses less digits than its factorization.

72664736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270783 (or 2270775 counting only the distinct ones).

The product of its digits is 254016, while the sum is 41.

The square root of 72664736 is about 8524.3613250495. The cubic root of 72664736 is about 417.2931285350.

The spelling of 72664736 in words is "seventy-two million, six hundred sixty-four thousand, seven hundred thirty-six".