77942992 has 20 divisors (see below), whose sum is σ = 152574436. Its totient is φ = 38568960.

The previous prime is 77942989. The next prime is 77943001. The reversal of 77942992 is 29924977.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22052416 + 55890576 = 4696^2 + 7476^2 .

It is a super-2 number, since 2×77942992² = 12150220003824128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23559 + ... + 26662.

Almost surely, 2^77942992 is an apocalyptic number.

It is an amenable number.

77942992 is a deficient number, since it is larger than the sum of its proper divisors (74631444).

77942992 is a wasteful number, since it uses less digits than its factorization.

77942992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50326 (or 50320 counting only the distinct ones).

The product of its digits is 571536, while the sum is 49.

The square root of 77942992 is about 8828.5328339425. The cubic root of 77942992 is about 427.1617506095.

The spelling of 77942992 in words is "seventy-seven million, nine hundred forty-two thousand, nine hundred ninety-two".