25610240 has 96 divisors (see below), whose sum is σ = 63980280. Its totient is φ = 9830400.

The previous prime is 25610237. The next prime is 25610257. The reversal of 25610240 is 4201652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6390784 + 19219456 = 2528^2 + 4384^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419810 + ... + 419870.

Almost surely, 2^25610240 is an apocalyptic number.

25610240 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 25610240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31990140).

25610240 is an abundant number, since it is smaller than the sum of its proper divisors (38370040).

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

25610240 is an equidigital number, since it uses as much as digits as its factorization.

25610240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 25610240 is about 5060.6560839480. The cubic root of 25610240 is about 294.7618109889.

Adding to 25610240 its reverse (4201652), we get a palindrome (29811892).

The spelling of 25610240 in words is "twenty-five million, six hundred ten thousand, two hundred forty".