77831893992 has 32 divisors (see below), whose sum is σ = 197042774400. Its totient is φ = 25615559424.

The previous prime is 77831893973. The next prime is 77831894033. The reversal of 77831893992 is 29939813877.

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, 20523393 + ... + 20527184.

It is an arithmetic number, because the mean of its divisors is an integer number (6157586700).

Almost surely, 2^77831893992 is an apocalyptic number.

It is an amenable number.

77831893992 is an abundant number, since it is smaller than the sum of its proper divisors (119210880408).

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

77831893992 is a wasteful number, since it uses less digits than its factorization.

77831893992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41050665 (or 41050661 counting only the distinct ones).

The product of its digits is 41150592, while the sum is 66.

The spelling of 77831893992 in words is "seventy-seven billion, eight hundred thirty-one million, eight hundred ninety-three thousand, nine hundred ninety-two".