77880631 has 4 divisors (see below), whose sum is σ = 80566200. Its totient is φ = 75195064.

The previous prime is 77880623. The next prime is 77880637. The reversal of 77880631 is 13608877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13608877 = 227 ⋅59951.

It is a cyclic number.

It is not a de Polignac number, because 77880631 - 2³ = 77880623 is a prime.

It is a super-2 number, since 2×77880631² = 12130785369916322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77880637) 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, 1342741 + ... + 1342798.

It is an arithmetic number, because the mean of its divisors is an integer number (20141550).

Almost surely, 2^77880631 is an apocalyptic number.

77880631 is a deficient number, since it is larger than the sum of its proper divisors (2685569).

77880631 is a wasteful number, since it uses less digits than its factorization.

77880631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685568.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 77880631 is about 8825.0003399433. Note that the first 3 decimals coincide. The cubic root of 77880631 is about 427.0477983448.

The spelling of 77880631 in words is "seventy-seven million, eight hundred eighty thousand, six hundred thirty-one".