77922491256 has 24 divisors (see below), whose sum is σ = 211040080680. Its totient is φ = 25974163728.

The previous prime is 77922491243. The next prime is 77922491291. The reversal of 77922491256 is 65219422977.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 541128340 + ... + 541128483.

It is an arithmetic number, because the mean of its divisors is an integer number (8793336695).

Almost surely, 2^77922491256 is an apocalyptic number.

It is an amenable number.

77922491256 is an abundant number, since it is smaller than the sum of its proper divisors (133117589424).

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

77922491256 is a wasteful number, since it uses less digits than its factorization.

77922491256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082256835 (or 1082256828 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The spelling of 77922491256 in words is "seventy-seven billion, nine hundred twenty-two million, four hundred ninety-one thousand, two hundred fifty-six".