25504240 has 80 divisors (see below), whose sum is σ = 62995968. Its totient is φ = 9582848.

The previous prime is 25504231. The next prime is 25504249. The reversal of 25504240 is 4240552.

It is an interprime number because it is at equal distance from previous prime (25504231) and next prime (25504249).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25504249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152637 + ... + 152803.

Almost surely, 2^25504240 is an apocalyptic number.

25504240 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 25504240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31497984).

25504240 is an abundant number, since it is smaller than the sum of its proper divisors (37491728).

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

25504240 is a wasteful number, since it uses less digits than its factorization.

25504240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 25504240 is about 5050.1722742893. The cubic root of 25504240 is about 294.3545785904.

Adding to 25504240 its reverse (4240552), we get a palindrome (29744792).

The spelling of 25504240 in words is "twenty-five million, five hundred four thousand, two hundred forty".