79978025 has 6 divisors (see below), whose sum is σ = 99172782. Its totient is φ = 63982400.

The previous prime is 79978001. The next prime is 79978043. The reversal of 79978025 is 52087997.

It can be written as a sum of positive squares in 3 ways, for example, as 1194649 + 78783376 = 1093^2 + 8876^2 .

It is not a de Polignac number, because 79978025 - 2²⁶ = 12869161 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1599536 + ... + 1599585.

It is an arithmetic number, because the mean of its divisors is an integer number (16528797).

Almost surely, 2^79978025 is an apocalyptic number.

It is an amenable number.

79978025 is a deficient number, since it is larger than the sum of its proper divisors (19194757).

79978025 is a wasteful number, since it uses less digits than its factorization.

79978025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3199131 (or 3199126 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 79978025 is about 8943.0433857832. The cubic root of 79978025 is about 430.8474813081.

The spelling of 79978025 in words is "seventy-nine million, nine hundred seventy-eight thousand, twenty-five".