79872005 has 4 divisors (see below), whose sum is σ = 95846412. Its totient is φ = 63897600.

The previous prime is 79871929. The next prime is 79872019. The reversal of 79872005 is 50027897.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37478884 + 42393121 = 6122^2 + 6511^2 .

It is not a de Polignac number, because 79872005 - 2¹⁶ = 79806469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79872005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7987196 + ... + 7987205.

It is an arithmetic number, because the mean of its divisors is an integer number (23961603).

Almost surely, 2^79872005 is an apocalyptic number.

It is an amenable number.

79872005 is a deficient number, since it is larger than the sum of its proper divisors (15974407).

79872005 is a wasteful number, since it uses less digits than its factorization.

79872005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15974406.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 79872005 is about 8937.1139077445. The cubic root of 79872005 is about 430.6570179534.

The spelling of 79872005 in words is "seventy-nine million, eight hundred seventy-two thousand, five".