79823721 has 8 divisors (see below), whose sum is σ = 112692384. Its totient is φ = 50085440.

The previous prime is 79823707. The next prime is 79823741. The reversal of 79823721 is 12732897.

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

It is a cyclic number.

It is not a de Polignac number, because 79823721 - 2¹¹ = 79821673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79823721.

It is not an unprimeable number, because it can be changed into a prime (79823741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 782535 + ... + 782636.

It is an arithmetic number, because the mean of its divisors is an integer number (14086548).

Almost surely, 2^79823721 is an apocalyptic number.

It is an amenable number.

79823721 is a deficient number, since it is larger than the sum of its proper divisors (32868663).

79823721 is a wasteful number, since it uses less digits than its factorization.

79823721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565191.

The product of its digits is 42336, while the sum is 39.

The square root of 79823721 is about 8934.4121798807. The cubic root of 79823721 is about 430.5702206041.

The spelling of 79823721 in words is "seventy-nine million, eight hundred twenty-three thousand, seven hundred twenty-one".