72781604 has 24 divisors (see below), whose sum is σ = 146021568. Its totient is φ = 31093920.

The previous prime is 72781567. The next prime is 72781649. The reversal of 72781604 is 40618727.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5342 + ... + 13194.

It is an arithmetic number, because the mean of its divisors is an integer number (6084232).

Almost surely, 2^72781604 is an apocalyptic number.

It is an amenable number.

72781604 is an abundant number, since it is smaller than the sum of its proper divisors (73239964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72781604 is a wasteful number, since it uses less digits than its factorization.

72781604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8195 (or 8193 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 72781604 is about 8531.2135127425. The cubic root of 72781604 is about 417.5167220524.

The spelling of 72781604 in words is "seventy-two million, seven hundred eighty-one thousand, six hundred four".