79999988 has 24 divisors (see below), whose sum is σ = 143035200. Its totient is φ = 39139328.

The previous prime is 79999987. The next prime is 80000023. The reversal of 79999988 is 88999997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79999981) 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, 59993 + ... + 61311.

It is an arithmetic number, because the mean of its divisors is an integer number (5959800).

Almost surely, 2^79999988 is an apocalyptic number.

It is an amenable number.

79999988 is a deficient number, since it is larger than the sum of its proper divisors (63035212).

79999988 is a wasteful number, since it uses less digits than its factorization.

79999988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639 (or 1637 counting only the distinct ones).

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

The square root of 79999988 is about 8944.2712391787. The cubic root of 79999988 is about 430.8869164620.

Subtracting 79999988 from its reverse (88999997), we obtain a palindrome (9000009).

The spelling of 79999988 in words is "seventy-nine million, nine hundred ninety-nine thousand, nine hundred eighty-eight".