77764404512 has 24 divisors (see below), whose sum is σ = 162104476716. Its totient is φ = 36595013632.

The previous prime is 77764404511. The next prime is 77764404521. The reversal of 77764404512 is 21540446777.

It can be written as a sum of positive squares in 2 ways, for example, as 71350957456 + 6413447056 = 267116^2 + 80084^2 .

It is not an unprimeable number, because it can be changed into a prime (77764404511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71474093 + ... + 71475180.

Almost surely, 2^77764404512 is an apocalyptic number.

It is an amenable number.

77764404512 is an abundant number, since it is smaller than the sum of its proper divisors (84340072204).

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

77764404512 is a wasteful number, since it uses less digits than its factorization.

77764404512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142949300 (or 142949292 counting only the distinct ones).

The product of its (nonzero) digits is 1317120, while the sum is 47.

The spelling of 77764404512 in words is "seventy-seven billion, seven hundred sixty-four million, four hundred four thousand, five hundred twelve".