77709270816 has 36 divisors (see below), whose sum is σ = 220985739702. Its totient is φ = 25903090176.

The previous prime is 77709270773. The next prime is 77709270887. The reversal of 77709270816 is 61807290777.

It can be written as a sum of positive squares in only one way, i.e., 54727923600 + 22981347216 = 233940^2 + 151596^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 134911641 + ... + 134912216.

Almost surely, 2^77709270816 is an apocalyptic number.

It is an amenable number.

77709270816 is an abundant number, since it is smaller than the sum of its proper divisors (143276468886).

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

77709270816 is a wasteful number, since it uses less digits than its factorization.

77709270816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269823873 (or 269823862 counting only the distinct ones).

The product of its (nonzero) digits is 2074464, while the sum is 54.

The spelling of 77709270816 in words is "seventy-seven billion, seven hundred nine million, two hundred seventy thousand, eight hundred sixteen".