25921588 has 54 divisors (see below), whose sum is σ = 58055298. Its totient is φ = 10090080.

The previous prime is 25921579. The next prime is 25921607. The reversal of 25921588 is 88512952.

It can be written as a sum of positive squares in only one way, i.e., 25826724 + 94864 = 5082^2 + 308^2 .

It is a nialpdrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 25921588.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23170 + ... + 24262.

Almost surely, 2^25921588 is an apocalyptic number.

25921588 is a gapful number since it is divisible by the number (28) 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 25921588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29027649).

25921588 is an abundant number, since it is smaller than the sum of its proper divisors (32133710).

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

25921588 is a wasteful number, since it uses less digits than its factorization.

25921588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1113 counting only the distinct ones).

The product of its digits is 57600, while the sum is 40.

The square root of 25921588 is about 5091.3247784835. The cubic root of 25921588 is about 295.9514925382.

The spelling of 25921588 in words is "twenty-five million, nine hundred twenty-one thousand, five hundred eighty-eight".