77421792 has 48 divisors (see below), whose sum is σ = 232267392. Its totient is φ = 22120320.

The previous prime is 77421779. The next prime is 77421803. The reversal of 77421792 is 29712477.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 77421792.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 56934 + ... + 58277.

It is an arithmetic number, because the mean of its divisors is an integer number (4838904).

Almost surely, 2^77421792 is an apocalyptic number.

It is an amenable number.

77421792 is an abundant number, since it is smaller than the sum of its proper divisors (154845600).

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

77421792 is a wasteful number, since it uses less digits than its factorization.

77421792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115231 (or 115223 counting only the distinct ones).

The product of its digits is 49392, while the sum is 39.

The square root of 77421792 is about 8798.9653937267. The cubic root of 77421792 is about 426.2074856047.

The spelling of 77421792 in words is "seventy-seven million, four hundred twenty-one thousand, seven hundred ninety-two".