77575939720 has 16 divisors (see below), whose sum is σ = 174545864460. Its totient is φ = 31030375872.

The previous prime is 77575939709. The next prime is 77575939751. The reversal of 77575939720 is 2793957577.

It can be written as a sum of positive squares in 2 ways, for example, as 77572276324 + 3663396 = 278518^2 + 1914^2 .

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 3 ways as a sum of consecutive naturals, for example, 969699207 + ... + 969699286.

Almost surely, 2^77575939720 is an apocalyptic number.

It is an amenable number.

77575939720 is an abundant number, since it is smaller than the sum of its proper divisors (96969924740).

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

77575939720 is a wasteful number, since it uses less digits than its factorization.

77575939720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939398504 (or 1939398500 counting only the distinct ones).

The product of its (nonzero) digits is 29172150, while the sum is 61.

The spelling of 77575939720 in words is "seventy-seven billion, five hundred seventy-five million, nine hundred thirty-nine thousand, seven hundred twenty".