25490240 has 28 divisors (see below), whose sum is σ = 60699396. Its totient is φ = 10195968.

The previous prime is 25490221. The next prime is 25490249. The reversal of 25490240 is 4209452.

It can be written as a sum of positive squares in 2 ways, for example, as 15555136 + 9935104 = 3944^2 + 3152^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25490249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39509 + ... + 40148.

Almost surely, 2^25490240 is an apocalyptic number.

25490240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25490240 is an abundant number, since it is smaller than the sum of its proper divisors (35209156).

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

25490240 is an equidigital number, since it uses as much as digits as its factorization.

25490240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79674 (or 79664 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 25490240 is about 5048.7859926917. The cubic root of 25490240 is about 294.3007088760.

Adding to 25490240 its reverse (4209452), we get a palindrome (29699692).

The spelling of 25490240 in words is "twenty-five million, four hundred ninety thousand, two hundred forty".