79947863 has 4 divisors (see below), whose sum is σ = 80739528. Its totient is φ = 79156200.

The previous prime is 79947851. The next prime is 79947869. The reversal of 79947863 is 36874997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36874997 = 4877 ⋅7561.

It is a cyclic number.

It is not a de Polignac number, because 79947863 - 2¹² = 79943767 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 (79947869) 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, 395681 + ... + 395882.

It is an arithmetic number, because the mean of its divisors is an integer number (20184882).

Almost surely, 2^79947863 is an apocalyptic number.

79947863 is a deficient number, since it is larger than the sum of its proper divisors (791665).

79947863 is a wasteful number, since it uses less digits than its factorization.

79947863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791664.

The product of its digits is 2286144, while the sum is 53.

The square root of 79947863 is about 8941.3568880791. The cubic root of 79947863 is about 430.7933128633.

The spelling of 79947863 in words is "seventy-nine million, nine hundred forty-seven thousand, eight hundred sixty-three".