25563500 has 96 divisors (see below), whose sum is σ = 60540480. Its totient is φ = 9408000.

The previous prime is 25563497. The next prime is 25563509. The reversal of 25563500 is 536552.

It is a self number, because there is not a number n which added to its sum of digits gives 25563500.

It is not an unprimeable number, because it can be changed into a prime (25563509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 594479 + ... + 594521.

It is an arithmetic number, because the mean of its divisors is an integer number (630630).

Almost surely, 2^25563500 is an apocalyptic number.

25563500 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 25563500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30270240).

25563500 is an abundant number, since it is smaller than the sum of its proper divisors (34976980).

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

25563500 is a wasteful number, since it uses less digits than its factorization.

25563500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 25563500 is about 5056.0359967073. The cubic root of 25563500 is about 294.5823833211.

The spelling of 25563500 in words is "twenty-five million, five hundred sixty-three thousand, five hundred".