72640868 has 12 divisors (see below), whose sum is σ = 127230012. Its totient is φ = 36289440.

The previous prime is 72640849. The next prime is 72640901. The reversal of 72640868 is 86804627.

It can be written as a sum of positive squares in 2 ways, for example, as 48748324 + 23892544 = 6982^2 + 4888^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2003 + ... + 12218.

It is an arithmetic number, because the mean of its divisors is an integer number (10602501).

Almost surely, 2^72640868 is an apocalyptic number.

It is an amenable number.

72640868 is a deficient number, since it is larger than the sum of its proper divisors (54589144).

72640868 is a wasteful number, since it uses less digits than its factorization.

72640868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15502 (or 15500 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 72640868 is about 8522.9612224860. The cubic root of 72640868 is about 417.2474344627.

The spelling of 72640868 in words is "seventy-two million, six hundred forty thousand, eight hundred sixty-eight".