77700815388 has 72 divisors (see below), whose sum is σ = 226236588032. Its totient is φ = 22025418912.

The previous prime is 77700815377. The next prime is 77700815411. The reversal of 77700815388 is 88351800777.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1181920 + ... + 1245927.

Almost surely, 2^77700815388 is an apocalyptic number.

It is an amenable number.

77700815388 is an abundant number, since it is smaller than the sum of its proper divisors (148535772644).

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

77700815388 is a wasteful number, since it uses less digits than its factorization.

77700815388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427991 (or 2427986 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 54.

The spelling of 77700815388 in words is "seventy-seven billion, seven hundred million, eight hundred fifteen thousand, three hundred eighty-eight".