25978605 has 16 divisors (see below), whose sum is σ = 43753920. Its totient is φ = 13125888.

The previous prime is 25978591. The next prime is 25978607. The reversal of 25978605 is 50687952.

It is not a de Polignac number, because 25978605 - 2⁵ = 25978573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25978607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45292 + ... + 45861.

It is an arithmetic number, because the mean of its divisors is an integer number (2734620).

Almost surely, 2^25978605 is an apocalyptic number.

It is an amenable number.

25978605 is a deficient number, since it is larger than the sum of its proper divisors (17775315).

25978605 is a wasteful number, since it uses less digits than its factorization.

25978605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91180.

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 25978605 is about 5096.9211294663. The cubic root of 25978605 is about 296.1683247935.

The spelling of 25978605 in words is "twenty-five million, nine hundred seventy-eight thousand, six hundred five".