25561144 has 48 divisors (see below), whose sum is σ = 56204280. Its totient is φ = 10866240.

The previous prime is 25561139. The next prime is 25561147. The reversal of 25561144 is 44116552.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77059 + ... + 77389.

Almost surely, 2^25561144 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 25561144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28102140).

25561144 is an abundant number, since it is smaller than the sum of its proper divisors (30643136).

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

25561144 is a wasteful number, since it uses less digits than its factorization.

25561144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 537 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 25561144 is about 5055.8030024913. The cubic root of 25561144 is about 294.5733332117.

Adding to 25561144 its reverse (44116552), we get a palindrome (69677696).

The spelling of 25561144 in words is "twenty-five million, five hundred sixty-one thousand, one hundred forty-four".