79897867 has 4 divisors (see below), whose sum is σ = 91311856. Its totient is φ = 68483880.

The previous prime is 79897849. The next prime is 79897891. The reversal of 79897867 is 76879897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76879897 = 263 ⋅292319.

It is a cyclic number.

It is not a de Polignac number, because 79897867 - 2¹¹ = 79895819 is a prime.

It is a super-2 number, since 2×79897867² = 12767338302299378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79897847) 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, 5706984 + ... + 5706997.

It is an arithmetic number, because the mean of its divisors is an integer number (22827964).

Almost surely, 2^79897867 is an apocalyptic number.

79897867 is a deficient number, since it is larger than the sum of its proper divisors (11413989).

79897867 is a wasteful number, since it uses less digits than its factorization.

79897867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11413988.

The product of its digits is 10668672, while the sum is 61.

The square root of 79897867 is about 8938.5606783195. The cubic root of 79897867 is about 430.7034941871.

The spelling of 79897867 in words is "seventy-nine million, eight hundred ninety-seven thousand, eight hundred sixty-seven".