79982865 has 24 divisors (see below), whose sum is σ = 139532328. Its totient is φ = 42382080.

The previous prime is 79982831. The next prime is 79982873. The reversal of 79982865 is 56828997.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 112896 + 79869969 = 336^2 + 8937^2 .

It is not a de Polignac number, because 79982865 - 2⁶ = 79982801 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1405 + ... + 12725.

It is an arithmetic number, because the mean of its divisors is an integer number (5813847).

Almost surely, 2^79982865 is an apocalyptic number.

It is an amenable number.

79982865 is a deficient number, since it is larger than the sum of its proper divisors (59549463).

79982865 is a wasteful number, since it uses less digits than its factorization.

79982865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11489 (or 11486 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 79982865 is about 8943.3139830826. The cubic root of 79982865 is about 430.8561722777.

The spelling of 79982865 in words is "seventy-nine million, nine hundred eighty-two thousand, eight hundred sixty-five".