77797992 has 32 divisors (see below), whose sum is σ = 199241280. Its totient is φ = 25299840.

The previous prime is 77797991. The next prime is 77798047. The reversal of 77797992 is 29979777.

It is not an unprimeable number, because it can be changed into a prime (77797991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38548 + ... + 40515.

It is an arithmetic number, because the mean of its divisors is an integer number (6226290).

Almost surely, 2^77797992 is an apocalyptic number.

It is an amenable number.

77797992 is an abundant number, since it is smaller than the sum of its proper divisors (121443288).

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

77797992 is a wasteful number, since it uses less digits than its factorization.

77797992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79113 (or 79109 counting only the distinct ones).

The product of its digits is 3500658, while the sum is 57.

The square root of 77797992 is about 8820.3170011060. The cubic root of 77797992 is about 426.8966983333.

The spelling of 77797992 in words is "seventy-seven million, seven hundred ninety-seven thousand, nine hundred ninety-two".