78932865 has 32 divisors (see below), whose sum is σ = 138441600. Its totient is φ = 38085120.

The previous prime is 78932863. The next prime is 78932891. The reversal of 78932865 is 56823987.

It is not a de Polignac number, because 78932865 - 2¹ = 78932863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78932863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36741 + ... + 38829.

It is an arithmetic number, because the mean of its divisors is an integer number (4326300).

Almost surely, 2^78932865 is an apocalyptic number.

It is an amenable number.

78932865 is a deficient number, since it is larger than the sum of its proper divisors (59508735).

78932865 is a wasteful number, since it uses less digits than its factorization.

78932865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337.

The product of its digits is 725760, while the sum is 48.

The square root of 78932865 is about 8884.4169758066. The cubic root of 78932865 is about 428.9624616009.

It can be divided in two parts, 78932 and 865, that added together give a palindrome (79797).

The spelling of 78932865 in words is "seventy-eight million, nine hundred thirty-two thousand, eight hundred sixty-five".