25487631 has 24 divisors (see below), whose sum is σ = 39901680. Its totient is φ = 15584256.

The previous prime is 25487629. The next prime is 25487633. The reversal of 25487631 is 13678452.

It is an interprime number because it is at equal distance from previous prime (25487629) and next prime (25487633).

It is not a de Polignac number, because 25487631 - 2¹ = 25487629 is a prime.

It is a super-2 number, since 2×25487631² = 1299238667984322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25487633) 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, 20335 + ... + 21551.

It is an arithmetic number, because the mean of its divisors is an integer number (1662570).

Almost surely, 2^25487631 is an apocalyptic number.

25487631 is a deficient number, since it is larger than the sum of its proper divisors (14414049).

25487631 is a wasteful number, since it uses less digits than its factorization.

25487631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415 (or 1412 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 25487631 is about 5048.5276071346. The cubic root of 25487631 is about 294.2906676897.

The spelling of 25487631 in words is "twenty-five million, four hundred eighty-seven thousand, six hundred thirty-one".