25256440 has 64 divisors (see below), whose sum is σ = 63076320. Its totient is φ = 9024000.

The previous prime is 25256431. The next prime is 25256447. The reversal of 25256440 is 4465252.

It is a super-2 number, since 2×25256440² = 1275775522947200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25256399 and 25256408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25256447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26370 + ... + 27310.

Almost surely, 2^25256440 is an apocalyptic number.

25256440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25256440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31538160).

25256440 is an abundant number, since it is smaller than the sum of its proper divisors (37819880).

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

25256440 is a wasteful number, since it uses less digits than its factorization.

25256440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024 (or 1020 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 25256440 is about 5025.5785736570. The cubic root of 25256440 is about 293.3981548664.

The spelling of 25256440 in words is "twenty-five million, two hundred fifty-six thousand, four hundred forty".