77991020024 has 16 divisors (see below), whose sum is σ = 146703370320. Its totient is φ = 38870121280.

The previous prime is 77991020021. The next prime is 77991020053. The reversal of 77991020024 is 42002019977.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77991020021) 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, 15670949 + ... + 15675924.

It is an arithmetic number, because the mean of its divisors is an integer number (9168960645).

Almost surely, 2^77991020024 is an apocalyptic number.

It is an amenable number.

77991020024 is a deficient number, since it is larger than the sum of its proper divisors (68712350296).

77991020024 is a wasteful number, since it uses less digits than its factorization.

77991020024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31347190 (or 31347186 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 41.

The spelling of 77991020024 in words is "seventy-seven billion, nine hundred ninety-one million, twenty thousand, twenty-four".