25579979 has 8 divisors (see below), whose sum is σ = 26762400. Its totient is φ = 24403456.

The previous prime is 25579927. The next prime is 25579993. The reversal of 25579979 is 97997552.

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 25579979 - 2¹⁶ = 25514443 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 25579979.

It is not an unprimeable number, because it can be changed into a prime (25579919) 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, 9089 + ... + 11565.

It is an arithmetic number, because the mean of its divisors is an integer number (3345300).

Almost surely, 2^25579979 is an apocalyptic number.

25579979 is a deficient number, since it is larger than the sum of its proper divisors (1182421).

25579979 is a wasteful number, since it uses less digits than its factorization.

25579979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949.

The product of its digits is 1786050, while the sum is 53.

The square root of 25579979 is about 5057.6653705045. The cubic root of 25579979 is about 294.6456686090.

The spelling of 25579979 in words is "twenty-five million, five hundred seventy-nine thousand, nine hundred seventy-nine".