25981285 has 16 divisors (see below), whose sum is σ = 34178112. Its totient is φ = 18803200.

The previous prime is 25981217. The next prime is 25981297. The reversal of 25981285 is 58218952.

It is a de Polignac number, because none of the positive numbers 2^k-25981285 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11445 + ... + 13525.

It is an arithmetic number, because the mean of its divisors is an integer number (2136132).

Almost surely, 2^25981285 is an apocalyptic number.

25981285 is the 4162-nd pentagonal number.

It is an amenable number.

25981285 is a deficient number, since it is larger than the sum of its proper divisors (8196827).

25981285 is a wasteful number, since it uses less digits than its factorization.

25981285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324.

The product of its digits is 57600, while the sum is 40.

The square root of 25981285 is about 5097.1840264993. The cubic root of 25981285 is about 296.1785088638.

It can be divided in two parts, 2598 and 1285, that added together give a palindrome (3883).

The spelling of 25981285 in words is "twenty-five million, nine hundred eighty-one thousand, two hundred eighty-five".