25044640 has 48 divisors (see below), whose sum is σ = 59604552. Its totient is φ = 9944064.

The previous prime is 25044637. The next prime is 25044653. The reversal of 25044640 is 4644052.

It can be written as a sum of positive squares in 4 ways, for example, as 21790224 + 3254416 = 4668^2 + 1804^2 .

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, 24622 + ... + 25618.

Almost surely, 2^25044640 is an apocalyptic number.

25044640 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 25044640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29802276).

25044640 is an abundant number, since it is smaller than the sum of its proper divisors (34559912).

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

25044640 is a wasteful number, since it uses less digits than its factorization.

25044640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169 (or 1161 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 25044640 is about 5004.4620090475. The cubic root of 25044640 is about 292.5757078726.

Adding to 25044640 its reverse (4644052), we get a palindrome (29688692).

The spelling of 25044640 in words is "twenty-five million, forty-four thousand, six hundred forty".