77989908 has 24 divisors (see below), whose sum is σ = 191554720. Its totient is φ = 24628320.

The previous prime is 77989883. The next prime is 77989909. The reversal of 77989908 is 80998977.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77989909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170803 + ... + 171258.

Almost surely, 2^77989908 is an apocalyptic number.

It is an amenable number.

77989908 is an abundant number, since it is smaller than the sum of its proper divisors (113564812).

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

77989908 is a wasteful number, since it uses less digits than its factorization.

77989908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342087 (or 342085 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 57.

The square root of 77989908 is about 8831.1895008543. The cubic root of 77989908 is about 427.2474401650.

The spelling of 77989908 in words is "seventy-seven million, nine hundred eighty-nine thousand, nine hundred eight".