25691256 has 80 divisors (see below), whose sum is σ = 73790640. Its totient is φ = 8346240.

The previous prime is 25691221. The next prime is 25691261. The reversal of 25691256 is 65219652.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 25691256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26085 + ... + 27051.

It is an arithmetic number, because the mean of its divisors is an integer number (922383).

Almost surely, 2^25691256 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 25691256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36895320).

25691256 is an abundant number, since it is smaller than the sum of its proper divisors (48099384).

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

25691256 is a wasteful number, since it uses less digits than its factorization.

25691256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026 (or 1013 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 25691256 is about 5068.6542592684. The cubic root of 25691256 is about 295.0723024922.

The spelling of 25691256 in words is "twenty-five million, six hundred ninety-one thousand, two hundred fifty-six".