77722992 has 30 divisors (see below), whose sum is σ = 217516832. Its totient is φ = 25907616.

The previous prime is 77722951. The next prime is 77722993. The reversal of 77722992 is 29922777.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77722993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 269728 + ... + 270015.

Almost surely, 2^77722992 is an apocalyptic number.

77722992 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

77722992 is an abundant number, since it is smaller than the sum of its proper divisors (139793840).

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

77722992 is a wasteful number, since it uses less digits than its factorization.

77722992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539757 (or 539748 counting only the distinct ones).

The product of its digits is 222264, while the sum is 45.

The square root of 77722992 is about 8816.0644280767. The cubic root of 77722992 is about 426.7594730843.

The spelling of 77722992 in words is "seventy-seven million, seven hundred twenty-two thousand, nine hundred ninety-two".