25421256 has 256 divisors, whose sum is σ = 91238400. Its totient is φ = 6386688.

The previous prime is 25421251. The next prime is 25421261. The reversal of 25421256 is 65212452.

It is an interprime number because it is at equal distance from previous prime (25421251) and next prime (25421261).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25421251) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 591171 + ... + 591213.

It is an arithmetic number, because the mean of its divisors is an integer number (356400).

Almost surely, 2^25421256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25421256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45619200).

25421256 is an abundant number, since it is smaller than the sum of its proper divisors (65817144).

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

25421256 is a wasteful number, since it uses less digits than its factorization.

25421256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 95 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 25421256 is about 5041.9496229137. The cubic root of 25421256 is about 294.0349812604.

The spelling of 25421256 in words is "twenty-five million, four hundred twenty-one thousand, two hundred fifty-six".