79999998 has 16 divisors (see below), whose sum is σ = 172307856. Its totient is φ = 24615360.

The previous prime is 79999987. The next prime is 80000023. The reversal of 79999998 is 89999997.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512743 + ... + 512898.

It is an arithmetic number, because the mean of its divisors is an integer number (10769241).

Almost surely, 2^79999998 is an apocalyptic number.

79999998 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

79999998 is an abundant number, since it is smaller than the sum of its proper divisors (92307858).

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

79999998 is a wasteful number, since it uses less digits than its factorization.

79999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025659.

The product of its digits is 29760696, while the sum is 69.

The square root of 79999998 is about 8944.2717981958. The cubic root of 79999998 is about 430.8869344157.

Subtracting 79999998 from its reverse (89999997), we obtain a palindrome (9999999).

The spelling of 79999998 in words is "seventy-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".