78865728 has 28 divisors (see below), whose sum is σ = 208666080. Its totient is φ = 26288512.

The previous prime is 78865711. The next prime is 78865729. The reversal of 78865728 is 82756887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78865729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205188 + ... + 205571.

It is an arithmetic number, because the mean of its divisors is an integer number (7452360).

Almost surely, 2^78865728 is an apocalyptic number.

It is an amenable number.

78865728 is an abundant number, since it is smaller than the sum of its proper divisors (129800352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78865728 is a wasteful number, since it uses less digits than its factorization.

78865728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410774 (or 410764 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 51.

The square root of 78865728 is about 8880.6378149320. The cubic root of 78865728 is about 428.8408079155.

The spelling of 78865728 in words is "seventy-eight million, eight hundred sixty-five thousand, seven hundred twenty-eight".