25253840 has 80 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 9185280.

The previous prime is 25253821. The next prime is 25253843. The reversal of 25253840 is 4835252.

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 (25253843) 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, 41861 + ... + 42459.

It is an arithmetic number, because the mean of its divisors is an integer number (803520).

Almost surely, 2^25253840 is an apocalyptic number.

25253840 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 25253840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32140800).

25253840 is an abundant number, since it is smaller than the sum of its proper divisors (39027760).

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

25253840 is a wasteful number, since it uses less digits than its factorization.

25253840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 25253840 is about 5025.3198903154. The cubic root of 25253840 is about 293.3880866570.

The spelling of 25253840 in words is "twenty-five million, two hundred fifty-three thousand, eight hundred forty".