25520900 has 18 divisors (see below), whose sum is σ = 55380570. Its totient is φ = 10208320.

The previous prime is 25520897. The next prime is 25520909. The reversal of 25520900 is 902552.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2172676 + 23348224 = 1474^2 + 4832^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25520909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127505 + ... + 127704.

Almost surely, 2^25520900 is an apocalyptic number.

25520900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25520900 is an abundant number, since it is smaller than the sum of its proper divisors (29859670).

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

25520900 is a wasteful number, since it uses less digits than its factorization.

25520900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255223 (or 255216 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 25520900 is about 5051.8214536937. The cubic root of 25520900 is about 294.4186578686.

The spelling of 25520900 in words is "twenty-five million, five hundred twenty thousand, nine hundred".