77813808 has 40 divisors (see below), whose sum is σ = 202503408. Its totient is φ = 25746432.

The previous prime is 77813783. The next prime is 77813809. The reversal of 77813808 is 80831877.

It is a self number, because there is not a number n which added to its sum of digits gives 77813808.

It is not an unprimeable number, because it can be changed into a prime (77813809) 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, 660 + ... + 12492.

Almost surely, 2^77813808 is an apocalyptic number.

It is an amenable number.

77813808 is an abundant number, since it is smaller than the sum of its proper divisors (124689600).

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

77813808 is a wasteful number, since it uses less digits than its factorization.

77813808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11981 (or 11975 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 77813808 is about 8821.2135219594. The cubic root of 77813808 is about 426.9256251326.

The spelling of 77813808 in words is "seventy-seven million, eight hundred thirteen thousand, eight hundred eight".