25478631 has 20 divisors (see below), whose sum is σ = 40301712. Its totient is φ = 15985728.

The previous prime is 25478627. The next prime is 25478633. The reversal of 25478631 is 13687452.

25478631 is a `hidden beast` number, since 2 + 547 + 86 + 31 = 666.

It is not a de Polignac number, because 25478631 - 2² = 25478627 is a prime.

It is a super-2 number, since 2×25478631² = 1298321275268322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25478633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7875 + ... + 10628.

Almost surely, 2^25478631 is an apocalyptic number.

25478631 is a deficient number, since it is larger than the sum of its proper divisors (14823081).

25478631 is a wasteful number, since it uses less digits than its factorization.

25478631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18532 (or 18523 counting only the distinct ones).

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

The square root of 25478631 is about 5047.6361794408. The cubic root of 25478631 is about 294.2560243782.

The spelling of 25478631 in words is "twenty-five million, four hundred seventy-eight thousand, six hundred thirty-one".