25505568 has 144 divisors (see below), whose sum is σ = 80904096. Its totient is φ = 7557120.

The previous prime is 25505549. The next prime is 25505609. The reversal of 25505568 is 86550552.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262896 + ... + 262992.

It is an arithmetic number, because the mean of its divisors is an integer number (561834).

Almost surely, 2^25505568 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 25505568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40452048).

25505568 is an abundant number, since it is smaller than the sum of its proper divisors (55398528).

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

25505568 is a wasteful number, since it uses less digits than its factorization.

25505568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The square root of 25505568 is about 5050.3037532410. The cubic root of 25505568 is about 294.3596874938.

It can be divided in two parts, 2550 and 5568, that added together give a palindrome (8118).

The spelling of 25505568 in words is "twenty-five million, five hundred five thousand, five hundred sixty-eight".