79999646 has 4 divisors (see below), whose sum is σ = 119999472. Its totient is φ = 39999822.

The previous prime is 79999627. The next prime is 79999657. The reversal of 79999646 is 64699997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64699997 = 19 ⋅3405263.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19999910 + ... + 19999913.

It is an arithmetic number, because the mean of its divisors is an integer number (29999868).

Almost surely, 2^79999646 is an apocalyptic number.

79999646 is a deficient number, since it is larger than the sum of its proper divisors (39999826).

79999646 is a wasteful number, since it uses less digits than its factorization.

79999646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39999825.

The product of its digits is 6613488, while the sum is 59.

The square root of 79999646 is about 8944.2521207757. The cubic root of 79999646 is about 430.8863024472.

The spelling of 79999646 in words is "seventy-nine million, nine hundred ninety-nine thousand, six hundred forty-six".