25561250 has 90 divisors (see below), whose sum is σ = 57026277. Its totient is φ = 8580000.

The previous prime is 25561247. The next prime is 25561253. The reversal of 25561250 is 5216552.

It is an interprime number because it is at equal distance from previous prime (25561247) and next prime (25561253).

It can be written as a sum of positive squares in 8 ways, for example, as 9966649 + 15594601 = 3157^2 + 3949^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3575.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25561253) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1966244 + ... + 1966256.

Almost surely, 2^25561250 is an apocalyptic number.

25561250 is an abundant number, since it is smaller than the sum of its proper divisors (31465027).

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

25561250 is a wasteful number, since it uses less digits than its factorization.

25561250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 25561250 is about 5055.8134854838. The cubic root of 25561250 is about 294.5737404018.

The spelling of 25561250 in words is "twenty-five million, five hundred sixty-one thousand, two hundred fifty".