79928780 has 12 divisors (see below), whose sum is σ = 167850480. Its totient is φ = 31971504.

The previous prime is 79928767. The next prime is 79928791. The reversal of 79928780 is 8782997.

It is a happy number.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1998200 + ... + 1998239.

It is an arithmetic number, because the mean of its divisors is an integer number (13987540).

Almost surely, 2^79928780 is an apocalyptic number.

It is an amenable number.

79928780 is an abundant number, since it is smaller than the sum of its proper divisors (87921700).

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

79928780 is a wasteful number, since it uses less digits than its factorization.

79928780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996448 (or 3996446 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 79928780 is about 8940.2897044783. The cubic root of 79928780 is about 430.7590343446.

It can be divided in two parts, 79928 and 780, that added together give a palindrome (80708).

The spelling of 79928780 in words is "seventy-nine million, nine hundred twenty-eight thousand, seven hundred eighty".