77908444 has 12 divisors (see below), whose sum is σ = 136544184. Its totient is φ = 38895824.

The previous prime is 77908427. The next prime is 77908459. The reversal of 77908444 is 44480977.

It is a happy number.

It is a super-2 number, since 2×77908444² = 12139451293002272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77908444.

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 3 ways as a sum of consecutive naturals, for example, 11527 + ... + 16990.

It is an arithmetic number, because the mean of its divisors is an integer number (11378682).

Almost surely, 2^77908444 is an apocalyptic number.

It is an amenable number.

77908444 is a deficient number, since it is larger than the sum of its proper divisors (58635740).

77908444 is a wasteful number, since it uses less digits than its factorization.

77908444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29204 (or 29202 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 77908444 is about 8826.5760065838. The cubic root of 77908444 is about 427.0986285561.

The spelling of 77908444 in words is "seventy-seven million, nine hundred eight thousand, four hundred forty-four".