79840428 has 24 divisors (see below), whose sum is σ = 186439680. Its totient is φ = 26592720.

The previous prime is 79840427. The next prime is 79840441. The reversal of 79840428 is 82404897.

It is a self number, because there is not a number n which added to its sum of digits gives 79840428.

It is not an unprimeable number, because it can be changed into a prime (79840421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26293 + ... + 29171.

It is an arithmetic number, because the mean of its divisors is an integer number (7768320).

Almost surely, 2^79840428 is an apocalyptic number.

It is an amenable number.

79840428 is an abundant number, since it is smaller than the sum of its proper divisors (106599252).

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

79840428 is a wasteful number, since it uses less digits than its factorization.

79840428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5197 (or 5195 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 79840428 is about 8935.3471113326. The cubic root of 79840428 is about 430.6002577693.

The spelling of 79840428 in words is "seventy-nine million, eight hundred forty thousand, four hundred twenty-eight".