25631490 has 16 divisors (see below), whose sum is σ = 61515648. Its totient is φ = 6835056.

The previous prime is 25631449. The next prime is 25631503. The reversal of 25631490 is 9413652.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 854383 = 25631490 / (2 + 5 + 6 + 3 + 1 + 4 + 9 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427162 + ... + 427221.

It is an arithmetic number, because the mean of its divisors is an integer number (3844728).

Almost surely, 2^25631490 is an apocalyptic number.

25631490 is an abundant number, since it is smaller than the sum of its proper divisors (35884158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25631490 is a wasteful number, since it uses less digits than its factorization.

25631490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854393.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 25631490 is about 5062.7551787540. The cubic root of 25631490 is about 294.8433142841.

The spelling of 25631490 in words is "twenty-five million, six hundred thirty-one thousand, four hundred ninety".