25731985 has 16 divisors (see below), whose sum is σ = 32630400. Its totient is φ = 19426176.

The previous prime is 25731967. The next prime is 25731997. The reversal of 25731985 is 58913752.

It is a cyclic number.

It is not a de Polignac number, because 25731985 - 2¹³ = 25723793 is a prime.

25731985 is a Rhonda number in base 16.

Its product of digits (75600) is a multiple of the sum of its prime divisors (1080).

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, 41397 + ... + 42013.

It is an arithmetic number, because the mean of its divisors is an integer number (2039400).

Almost surely, 2^25731985 is an apocalyptic number.

It is an amenable number.

25731985 is a deficient number, since it is larger than the sum of its proper divisors (6898415).

25731985 is a wasteful number, since it uses less digits than its factorization.

25731985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its digits is 75600, while the sum is 40.

The square root of 25731985 is about 5072.6704012778. The cubic root of 25731985 is about 295.2281487015.

The spelling of 25731985 in words is "twenty-five million, seven hundred thirty-one thousand, nine hundred eighty-five".