79988999 has 4 divisors (see below), whose sum is σ = 80010000. Its totient is φ = 79968000.

The previous prime is 79988983. The next prime is 79989023. The reversal of 79988999 is 99988997.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79988999 - 2⁴ = 79988983 is a prime.

It is a super-2 number, since 2×79988999² = 12796479922044002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79988969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3002 + ... + 12999.

It is an arithmetic number, because the mean of its divisors is an integer number (20002500).

Almost surely, 2^79988999 is an apocalyptic number.

79988999 is a deficient number, since it is larger than the sum of its proper divisors (21001).

79988999 is a wasteful number, since it uses less digits than its factorization.

79988999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21000.

The product of its digits is 26453952, while the sum is 68.

The square root of 79988999 is about 8943.6569142605. The cubic root of 79988999 is about 430.8671863210.

It can be divided in two parts, 799 and 88999, that added together give a palindrome (89798).

The spelling of 79988999 in words is "seventy-nine million, nine hundred eighty-eight thousand, nine hundred ninety-nine".