25564660 has 48 divisors (see below), whose sum is σ = 60600960. Its totient is φ = 8973440.

The previous prime is 25564619. The next prime is 25564667. The reversal of 25564660 is 6646552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25564667) 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, 4377 + ... + 8383.

It is an arithmetic number, because the mean of its divisors is an integer number (1262520).

Almost surely, 2^25564660 is an apocalyptic number.

25564660 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 25564660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30300480).

25564660 is an abundant number, since it is smaller than the sum of its proper divisors (35036300).

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

25564660 is a wasteful number, since it uses less digits than its factorization.

25564660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056 (or 4054 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 25564660 is about 5056.1507097791. The cubic root of 25564660 is about 294.5868390281.

The spelling of 25564660 in words is "twenty-five million, five hundred sixty-four thousand, six hundred sixty".