77831916 has 24 divisors (see below), whose sum is σ = 192291120. Its totient is φ = 24417792.

The previous prime is 77831909. The next prime is 77831921. The reversal of 77831916 is 61913877.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190561 + ... + 190968.

It is an arithmetic number, because the mean of its divisors is an integer number (8012130).

Almost surely, 2^77831916 is an apocalyptic number.

It is an amenable number.

77831916 is an abundant number, since it is smaller than the sum of its proper divisors (114459204).

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

77831916 is a wasteful number, since it uses less digits than its factorization.

77831916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381553 (or 381551 counting only the distinct ones).

The product of its digits is 63504, while the sum is 42.

The square root of 77831916 is about 8822.2398516477. The cubic root of 77831916 is about 426.9587390911.

The spelling of 77831916 in words is "seventy-seven million, eight hundred thirty-one thousand, nine hundred sixteen".