72640552 has 8 divisors (see below), whose sum is σ = 136201050. Its totient is φ = 36320272.

The previous prime is 72640537. The next prime is 72640573. The reversal of 72640552 is 25504627.

It can be written as a sum of positive squares in only one way, i.e., 51351556 + 21288996 = 7166^2 + 4614^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4540027 + ... + 4540042.

Almost surely, 2^72640552 is an apocalyptic number.

It is an amenable number.

72640552 is a deficient number, since it is larger than the sum of its proper divisors (63560498).

72640552 is a wasteful number, since it uses less digits than its factorization.

72640552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9080075 (or 9080071 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 72640552 is about 8522.9426843080. The cubic root of 72640552 is about 417.2468294297.

The spelling of 72640552 in words is "seventy-two million, six hundred forty thousand, five hundred fifty-two".