77249644 has 24 divisors (see below), whose sum is σ = 141926400. Its totient is φ = 36741840.

The previous prime is 77249639. The next prime is 77249651. The reversal of 77249644 is 44694277.

It is a self number, because there is not a number n which added to its sum of digits gives 77249644.

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, 2037 + ... + 12595.

It is an arithmetic number, because the mean of its divisors is an integer number (5913600).

Almost surely, 2^77249644 is an apocalyptic number.

It is an amenable number.

77249644 is a deficient number, since it is larger than the sum of its proper divisors (64676756).

77249644 is a wasteful number, since it uses less digits than its factorization.

77249644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10653 (or 10651 counting only the distinct ones).

The product of its digits is 338688, while the sum is 43.

The square root of 77249644 is about 8789.1776634677. The cubic root of 77249644 is about 425.8913592197.

The spelling of 77249644 in words is "seventy-seven million, two hundred forty-nine thousand, six hundred forty-four".