25245240 has 64 divisors (see below), whose sum is σ = 76723200. Its totient is φ = 6644352.

The previous prime is 25245229. The next prime is 25245247. The reversal of 25245240 is 4254252.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25245240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25245247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8149 + ... + 10811.

It is an arithmetic number, because the mean of its divisors is an integer number (1198800).

Almost surely, 2^25245240 is an apocalyptic number.

25245240 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 25245240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38361600).

25245240 is an abundant number, since it is smaller than the sum of its proper divisors (51477960).

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

25245240 is a wasteful number, since it uses less digits than its factorization.

25245240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756 (or 2752 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 25245240 is about 5024.4641505339. The cubic root of 25245240 is about 293.3547791942.

Adding to 25245240 its reverse (4254252), we get a palindrome (29499492).

The spelling of 25245240 in words is "twenty-five million, two hundred forty-five thousand, two hundred forty".