77808916 has 12 divisors (see below), whose sum is σ = 138398260. Its totient is φ = 38266560.

The previous prime is 77808911. The next prime is 77808959. The reversal of 77808916 is 61980877.

It can be written as a sum of positive squares in 2 ways, for example, as 17808400 + 60000516 = 4220^2 + 7746^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77808911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159201 + ... + 159688.

Almost surely, 2^77808916 is an apocalyptic number.

It is an amenable number.

77808916 is a deficient number, since it is larger than the sum of its proper divisors (60589344).

77808916 is a wasteful number, since it uses less digits than its factorization.

77808916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318954 (or 318952 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 77808916 is about 8820.9362314893. The cubic root of 77808916 is about 426.9166782889.

The spelling of 77808916 in words is "seventy-seven million, eight hundred eight thousand, nine hundred sixteen".