25563840 has 112 divisors (see below), whose sum is σ = 83880960. Its totient is φ = 6589440.

The previous prime is 25563829. The next prime is 25563841. The reversal of 25563840 is 4836552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25563841) 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, 29331 + ... + 30189.

Almost surely, 2^25563840 is an apocalyptic number.

25563840 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 25563840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41940480).

25563840 is an abundant number, since it is smaller than the sum of its proper divisors (58317120).

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

25563840 is a wasteful number, since it uses less digits than its factorization.

25563840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 900 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 25563840 is about 5056.0696197738. The cubic root of 25563840 is about 294.5836893182.

The spelling of 25563840 in words is "twenty-five million, five hundred sixty-three thousand, eight hundred forty".