77980775 has 12 divisors (see below), whose sum is σ = 96919392. Its totient is φ = 62240640.

The previous prime is 77980759. The next prime is 77980781. The reversal of 77980775 is 57708977.

It is not a de Polignac number, because 77980775 - 2⁴ = 77980759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8207 + ... + 14943.

It is an arithmetic number, because the mean of its divisors is an integer number (8076616).

Almost surely, 2^77980775 is an apocalyptic number.

77980775 is a deficient number, since it is larger than the sum of its proper divisors (18938617).

77980775 is a wasteful number, since it uses less digits than its factorization.

77980775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7210 (or 7205 counting only the distinct ones).

The product of its (nonzero) digits is 864360, while the sum is 50.

The square root of 77980775 is about 8830.6723979548. The cubic root of 77980775 is about 427.2307619250.

The spelling of 77980775 in words is "seventy-seven million, nine hundred eighty thousand, seven hundred seventy-five".