77974644 has 24 divisors (see below), whose sum is σ = 198481248. Its totient is φ = 23628640.

The previous prime is 77974583. The next prime is 77974679. The reversal of 77974644 is 44647977.

77974644 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

77974644 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 77974593 and 77974602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295227 + ... + 295490.

It is an arithmetic number, because the mean of its divisors is an integer number (8270052).

Almost surely, 2^77974644 is an apocalyptic number.

It is an amenable number.

77974644 is an abundant number, since it is smaller than the sum of its proper divisors (120506604).

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

77974644 is a wasteful number, since it uses less digits than its factorization.

77974644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590735 (or 590733 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 48.

The square root of 77974644 is about 8830.3252488229. The cubic root of 77974644 is about 427.2195650608.

The spelling of 77974644 in words is "seventy-seven million, nine hundred seventy-four thousand, six hundred forty-four".