25724631 has 4 divisors (see below), whose sum is σ = 34299512. Its totient is φ = 17149752.

The previous prime is 25724623. The next prime is 25724639. The reversal of 25724631 is 13642752.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (25724623) and next prime (25724639).

It is not a de Polignac number, because 25724631 - 2³ = 25724623 is a prime.

It is a super-2 number, since 2×25724631² = 1323513280172322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25724639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4287436 + ... + 4287441.

It is an arithmetic number, because the mean of its divisors is an integer number (8574878).

Almost surely, 2^25724631 is an apocalyptic number.

25724631 is a deficient number, since it is larger than the sum of its proper divisors (8574881).

25724631 is an equidigital number, since it uses as much as digits as its factorization.

25724631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8574880.

The product of its digits is 10080, while the sum is 30.

The square root of 25724631 is about 5071.9454847228. The cubic root of 25724631 is about 295.2000213901.

The spelling of 25724631 in words is "twenty-five million, seven hundred twenty-four thousand, six hundred thirty-one".