77969916 has 36 divisors (see below), whose sum is σ = 200436600. Its totient is φ = 25548768.

The previous prime is 77969911. The next prime is 77969917. The reversal of 77969916 is 61996977.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77969911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16231 + ... + 20478.

Almost surely, 2^77969916 is an apocalyptic number.

It is an amenable number.

77969916 is an abundant number, since it is smaller than the sum of its proper divisors (122466684).

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

77969916 is a wasteful number, since it uses less digits than its factorization.

77969916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36778 (or 36773 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 54.

The square root of 77969916 is about 8830.0575309564. The cubic root of 77969916 is about 427.2109300532.

The spelling of 77969916 in words is "seventy-seven million, nine hundred sixty-nine thousand, nine hundred sixteen".