79663865 has 32 divisors (see below), whose sum is σ = 104457600. Its totient is φ = 58129920.

The previous prime is 79663847. The next prime is 79663867. The reversal of 79663865 is 56836697.

It is not a de Polignac number, because 79663865 - 2¹⁶ = 79598329 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79663867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341789 + ... + 342021.

It is an arithmetic number, because the mean of its divisors is an integer number (3264300).

Almost surely, 2^79663865 is an apocalyptic number.

It is an amenable number.

79663865 is a deficient number, since it is larger than the sum of its proper divisors (24793735).

79663865 is a wasteful number, since it uses less digits than its factorization.

79663865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377.

The product of its digits is 1632960, while the sum is 50.

The square root of 79663865 is about 8925.4616127123. The cubic root of 79663865 is about 430.2826067236.

The spelling of 79663865 in words is "seventy-nine million, six hundred sixty-three thousand, eight hundred sixty-five".