77561872 has 20 divisors (see below), whose sum is σ = 152825040. Its totient is φ = 38123168.

The previous prime is 77561851. The next prime is 77561909. The reversal of 77561872 is 27816577.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40138 + ... + 42025.

It is an arithmetic number, because the mean of its divisors is an integer number (7641252).

Almost surely, 2^77561872 is an apocalyptic number.

It is an amenable number.

77561872 is a deficient number, since it is larger than the sum of its proper divisors (75263168).

77561872 is a wasteful number, since it uses less digits than its factorization.

77561872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82230 (or 82224 counting only the distinct ones).

The product of its digits is 164640, while the sum is 43.

The square root of 77561872 is about 8806.9218232025. The cubic root of 77561872 is about 426.4643778484.

The spelling of 77561872 in words is "seventy-seven million, five hundred sixty-one thousand, eight hundred seventy-two".