25325440 has 64 divisors (see below), whose sum is σ = 69204960. Its totient is φ = 8681472.

The previous prime is 25325437. The next prime is 25325449. The reversal of 25325440 is 4452352.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×25325440² = 1282755822387200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25325449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1654 + ... + 7306.

Almost surely, 2^25325440 is an apocalyptic number.

25325440 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 25325440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34602480).

25325440 is an abundant number, since it is smaller than the sum of its proper divisors (43879520).

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

25325440 is an equidigital number, since it uses as much as digits as its factorization.

25325440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5679 (or 5667 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 25325440 is about 5032.4387726032. The cubic root of 25325440 is about 293.6650975394.

Adding to 25325440 its reverse (4452352), we get a palindrome (29777792).

The spelling of 25325440 in words is "twenty-five million, three hundred twenty-five thousand, four hundred forty".