79559999 has 4 divisors (see below), whose sum is σ = 80649936. Its totient is φ = 78470064.

The previous prime is 79559989. The next prime is 79560029. The reversal of 79559999 is 99995597.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79559999 is a prime.

It is a Duffinian number.

79559999 is a modest number, since divided by 9999 gives 7955 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79559929) 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, 544859 + ... + 545004.

It is an arithmetic number, because the mean of its divisors is an integer number (20162484).

Almost surely, 2^79559999 is an apocalyptic number.

79559999 is a deficient number, since it is larger than the sum of its proper divisors (1089937).

79559999 is a wasteful number, since it uses less digits than its factorization.

79559999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089936.

The product of its digits is 10333575, while the sum is 62.

The square root of 79559999 is about 8919.6411923350. The cubic root of 79559999 is about 430.0955241177.

The spelling of 79559999 in words is "seventy-nine million, five hundred fifty-nine thousand, nine hundred ninety-nine".