79981863 has 8 divisors (see below), whose sum is σ = 114845808. Its totient is φ = 49219584.

The previous prime is 79981843. The next prime is 79981877. The reversal of 79981863 is 36818997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79981863 - 2⁸ = 79981607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79981813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025370 + ... + 1025447.

It is an arithmetic number, because the mean of its divisors is an integer number (14355726).

Almost surely, 2^79981863 is an apocalyptic number.

79981863 is a deficient number, since it is larger than the sum of its proper divisors (34863945).

79981863 is a wasteful number, since it uses less digits than its factorization.

79981863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050833.

The product of its digits is 653184, while the sum is 51.

The square root of 79981863 is about 8943.2579634046. The cubic root of 79981863 is about 430.8543730603.

The spelling of 79981863 in words is "seventy-nine million, nine hundred eighty-one thousand, eight hundred sixty-three".