25245440 has 108 divisors (see below), whose sum is σ = 66875592. Its totient is φ = 9123840.

The previous prime is 25245431. The next prime is 25245491. The reversal of 25245440 is 4454252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154799 + ... + 154961.

Almost surely, 2^25245440 is an apocalyptic number.

25245440 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 25245440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33437796).

25245440 is an abundant number, since it is smaller than the sum of its proper divisors (41630152).

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

25245440 is a wasteful number, since it uses less digits than its factorization.

25245440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 25245440 is about 5024.4840531143. The cubic root of 25245440 is about 293.3555538723.

Adding to 25245440 its reverse (4454252), we get a palindrome (29699692).

The spelling of 25245440 in words is "twenty-five million, two hundred forty-five thousand, four hundred forty".