79859999 has 8 divisors (see below), whose sum is σ = 87285888. Its totient is φ = 72737280.

The previous prime is 79859959. The next prime is 79860017. The reversal of 79859999 is 99995897.

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 79859999 - 2¹² = 79855903 is a prime.

79859999 is a modest number, since divided by 9999 gives 7985 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79859959) 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, 75242 + ... + 76295.

It is an arithmetic number, because the mean of its divisors is an integer number (10910736).

Almost surely, 2^79859999 is an apocalyptic number.

79859999 is a deficient number, since it is larger than the sum of its proper divisors (7425889).

79859999 is a wasteful number, since it uses less digits than its factorization.

79859999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151585.

The product of its digits is 16533720, while the sum is 65.

The square root of 79859999 is about 8936.4421891489. The cubic root of 79859999 is about 430.6354387311.

The spelling of 79859999 in words is "seventy-nine million, eight hundred fifty-nine thousand, nine hundred ninety-nine".