77421444 has 24 divisors (see below), whose sum is σ = 183613248. Its totient is φ = 25383840.

The previous prime is 77421437. The next prime is 77421467. The reversal of 77421444 is 44412477.

It is a happy 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, 52152 + ... + 53615.

It is an arithmetic number, because the mean of its divisors is an integer number (7650552).

Almost surely, 2^77421444 is an apocalyptic number.

It is an amenable number.

77421444 is an abundant number, since it is smaller than the sum of its proper divisors (106191804).

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

77421444 is a wasteful number, since it uses less digits than its factorization.

77421444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105835 (or 105833 counting only the distinct ones).

The product of its digits is 25088, while the sum is 33.

The square root of 77421444 is about 8798.9456186523. The cubic root of 77421444 is about 426.2068470230.

The spelling of 77421444 in words is "seventy-seven million, four hundred twenty-one thousand, four hundred forty-four".