25881440 has 96 divisors (see below), whose sum is σ = 68838336. Its totient is φ = 9123840.

The previous prime is 25881433. The next prime is 25881451. The reversal of 25881440 is 4418852.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 25881397 and 25881406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47570 + ... + 48110.

It is an arithmetic number, because the mean of its divisors is an integer number (717066).

Almost surely, 2^25881440 is an apocalyptic number.

25881440 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 25881440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34419168).

25881440 is an abundant number, since it is smaller than the sum of its proper divisors (42956896).

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

25881440 is a wasteful number, since it uses less digits than its factorization.

25881440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 584 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 25881440 is about 5087.3804654262. The cubic root of 25881440 is about 295.7986212440.

The spelling of 25881440 in words is "twenty-five million, eight hundred eighty-one thousand, four hundred forty".