25561560 has 64 divisors (see below), whose sum is σ = 77061600. Its totient is φ = 6782976.

The previous prime is 25561559. The next prime is 25561603. The reversal of 25561560 is 6516552.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32856 + ... + 33624.

Almost surely, 2^25561560 is an apocalyptic number.

25561560 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 25561560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38530800).

25561560 is an abundant number, since it is smaller than the sum of its proper divisors (51500040).

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

25561560 is a wasteful number, since it uses less digits than its factorization.

25561560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060 (or 1056 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 25561560 is about 5055.8441431674. The cubic root of 25561560 is about 294.5749312341.

The spelling of 25561560 in words is "twenty-five million, five hundred sixty-one thousand, five hundred sixty".