77312989944 has 64 divisors (see below), whose sum is σ = 214814822400. Its totient is φ = 25764214752.

The previous prime is 77312989937. The next prime is 77312989961. The reversal of 77312989944 is 44998921377.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811759 + ... + 901985.

It is an arithmetic number, because the mean of its divisors is an integer number (3356481600).

Almost surely, 2^77312989944 is an apocalyptic number.

It is an amenable number.

77312989944 is an abundant number, since it is smaller than the sum of its proper divisors (137501832456).

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

77312989944 is a wasteful number, since it uses less digits than its factorization.

77312989944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94209 (or 94199 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 63.

The spelling of 77312989944 in words is "seventy-seven billion, three hundred twelve million, nine hundred eighty-nine thousand, nine hundred forty-four".