25631040 has 56 divisors (see below), whose sum is σ = 81381600. Its totient is φ = 6834688.

The previous prime is 25631033. The next prime is 25631063. The reversal of 25631040 is 4013652.

It is a happy number.

It is a super-2 number, since 2×25631040² = 1313900422963200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25630998 and 25631016.

It is a congruent number.

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, 12390 + ... + 14309.

Almost surely, 2^25631040 is an apocalyptic number.

25631040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25631040 is an abundant number, since it is smaller than the sum of its proper divisors (55750560).

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

25631040 is a wasteful number, since it uses less digits than its factorization.

25631040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26719 (or 26709 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 25631040 is about 5062.7107363546. The cubic root of 25631040 is about 294.8415887990.

Adding to 25631040 its reverse (4013652), we get a palindrome (29644692).

The spelling of 25631040 in words is "twenty-five million, six hundred thirty-one thousand, forty".