77856427316 has 24 divisors (see below), whose sum is σ = 138815505864. Its totient is φ = 38201676800.

The previous prime is 77856427307. The next prime is 77856427321. The reversal of 77856427316 is 61372465877.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15757780900 + 62098646416 = 125530^2 + 249196^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 807065 + ... + 898368.

It is an arithmetic number, because the mean of its divisors is an integer number (5783979411).

Almost surely, 2^77856427316 is an apocalyptic number.

It is an amenable number.

77856427316 is a deficient number, since it is larger than the sum of its proper divisors (60959078548).

77856427316 is a wasteful number, since it uses less digits than its factorization.

77856427316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705651 (or 1705649 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 56.

The spelling of 77856427316 in words is "seventy-seven billion, eight hundred fifty-six million, four hundred twenty-seven thousand, three hundred sixteen".