79898639 has 4 divisors (see below), whose sum is σ = 81091224. Its totient is φ = 78706056.

The previous prime is 79898633. The next prime is 79898641. The reversal of 79898639 is 93689897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93689897 = 7 ⋅13384271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79898639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79898633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 596192 + ... + 596325.

It is an arithmetic number, because the mean of its divisors is an integer number (20272806).

Almost surely, 2^79898639 is an apocalyptic number.

79898639 is a deficient number, since it is larger than the sum of its proper divisors (1192585).

79898639 is a wasteful number, since it uses less digits than its factorization.

79898639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192584.

The product of its digits is 5878656, while the sum is 59.

The square root of 79898639 is about 8938.6038619015. The cubic root of 79898639 is about 430.7048813832.

The spelling of 79898639 in words is "seventy-nine million, eight hundred ninety-eight thousand, six hundred thirty-nine".