77908 has 6 divisors (see below), whose sum is σ = 136346. Its totient is φ = 38952.

The previous prime is 77899. The next prime is 77929. The reversal of 77908 is 80977.

It can be written as a sum of positive squares in only one way, i.e., 71824 + 6084 = 268^2 + 78^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9735 + ... + 9742.

2⁷⁷⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

77908 is a deficient number, since it is larger than the sum of its proper divisors (58438).

77908 is a wasteful number, since it uses less digits than its factorization.

77908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19481 (or 19479 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 77908 is about 279.1200458584. The cubic root of 77908 is about 42.7097817210.

Subtracting from 77908 its sum of digits (31), we obtain a palindrome (77877).

The spelling of 77908 in words is "seventy-seven thousand, nine hundred eight".