79787631 has 80 divisors (see below), whose sum is σ = 145203840. Its totient is φ = 38525760.

The previous prime is 79787597. The next prime is 79787633. The reversal of 79787631 is 13678797.

It is a happy number.

It is not a de Polignac number, because 79787631 - 2¹⁴ = 79771247 is a prime.

It is a super-2 number, since 2×79787631² = 12732132121184322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79787633) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1505401 + ... + 1505453.

It is an arithmetic number, because the mean of its divisors is an integer number (1815048).

Almost surely, 2^79787631 is an apocalyptic number.

79787631 is a deficient number, since it is larger than the sum of its proper divisors (65416209).

79787631 is a wasteful number, since it uses less digits than its factorization.

79787631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 93 counting only the distinct ones).

The product of its digits is 444528, while the sum is 48.

The square root of 79787631 is about 8932.3922327672. The cubic root of 79787631 is about 430.5053208411.

The spelling of 79787631 in words is "seventy-nine million, seven hundred eighty-seven thousand, six hundred thirty-one".