25859988 has 144 divisors (see below), whose sum is σ = 85962240. Its totient is φ = 6350400.

The previous prime is 25859987. The next prime is 25860047. The reversal of 25859988 is 88995852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25859987) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52423 + ... + 52913.

It is an arithmetic number, because the mean of its divisors is an integer number (596960).

Almost surely, 2^25859988 is an apocalyptic number.

25859988 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 25859988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42981120).

25859988 is an abundant number, since it is smaller than the sum of its proper divisors (60102252).

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

25859988 is a wasteful number, since it uses less digits than its factorization.

25859988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538 (or 533 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 54.

The square root of 25859988 is about 5085.2716741586. The cubic root of 25859988 is about 295.7168737834.

The spelling of 25859988 in words is "twenty-five million, eight hundred fifty-nine thousand, nine hundred eighty-eight".