25556500 has 48 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 10077600.

The previous prime is 25556459. The next prime is 25556507. The reversal of 25556500 is 565552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25556507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39177 + ... + 39823.

It is an arithmetic number, because the mean of its divisors is an integer number (1179360).

Almost surely, 2^25556500 is an apocalyptic number.

25556500 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 25556500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28304640).

25556500 is an abundant number, since it is smaller than the sum of its proper divisors (31052780).

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

25556500 is a wasteful number, since it uses less digits than its factorization.

25556500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 25556500 is about 5055.3437074051. The cubic root of 25556500 is about 294.5554925729. Note that the first 3 decimals are identical.

The spelling of 25556500 in words is "twenty-five million, five hundred fifty-six thousand, five hundred".