25707231 has 24 divisors (see below), whose sum is σ = 40941264. Its totient is φ = 15413760.

The previous prime is 25707211. The next prime is 25707239. The reversal of 25707231 is 13270752.

It is not a de Polignac number, because 25707231 - 2⁷ = 25707103 is a prime.

It is a super-2 number, since 2×25707231² = 1321723451374722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25707195 and 25707204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25707239) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8265 + ... + 10941.

It is an arithmetic number, because the mean of its divisors is an integer number (1705886).

Almost surely, 2^25707231 is an apocalyptic number.

25707231 is a deficient number, since it is larger than the sum of its proper divisors (15234033).

25707231 is a wasteful number, since it uses less digits than its factorization.

25707231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2791 (or 2788 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 25707231 is about 5070.2298764454. The cubic root of 25707231 is about 295.1334491504.

Adding to 25707231 its reverse (13270752), we get a palindrome (38977983).

It can be divided in two parts, 2570 and 7231, that added together give a square (9801 = 99²).

The spelling of 25707231 in words is "twenty-five million, seven hundred seven thousand, two hundred thirty-one".