77922920 has 16 divisors (see below), whose sum is σ = 175326660. Its totient is φ = 31169152.

The previous prime is 77922907. The next prime is 77922931. The reversal of 77922920 is 2922977.

It can be written as a sum of positive squares in 2 ways, for example, as 68790436 + 9132484 = 8294^2 + 3022^2 .

It is a super-2 number, since 2×77922920² = 12143962922652800, which contains 22 as substring.

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, 973997 + ... + 974076.

Almost surely, 2^77922920 is an apocalyptic number.

It is an amenable number.

77922920 is an abundant number, since it is smaller than the sum of its proper divisors (97403740).

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

77922920 is a wasteful number, since it uses less digits than its factorization.

77922920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948084 (or 1948080 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 77922920 is about 8827.3959920239. The cubic root of 77922920 is about 427.1250796763.

The spelling of 77922920 in words is "seventy-seven million, nine hundred twenty-two thousand, nine hundred twenty".