79998420 has 48 divisors (see below), whose sum is σ = 224598528. Its totient is φ = 21275520.

The previous prime is 79998419. The next prime is 79998427. The reversal of 79998420 is 2489997.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 79998420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79998427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23677 + ... + 26843.

It is an arithmetic number, because the mean of its divisors is an integer number (4679136).

Almost surely, 2^79998420 is an apocalyptic number.

It is an amenable number.

79998420 is an abundant number, since it is smaller than the sum of its proper divisors (144600108).

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

79998420 is a wasteful number, since it uses less digits than its factorization.

79998420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600 (or 3598 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 79998420 is about 8944.1835848779. The cubic root of 79998420 is about 430.8841013154.

The spelling of 79998420 in words is "seventy-nine million, nine hundred ninety-eight thousand, four hundred twenty".