25575220 has 48 divisors (see below), whose sum is σ = 59222016. Its totient is φ = 9200000.

The previous prime is 25575181. The next prime is 25575227. The reversal of 25575220 is 2257552.

25575220 = 495² + 496² + ... + 582².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25575227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21645 + ... + 22795.

It is an arithmetic number, because the mean of its divisors is an integer number (1233792).

Almost surely, 2^25575220 is an apocalyptic number.

25575220 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 25575220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29611008).

25575220 is an abundant number, since it is smaller than the sum of its proper divisors (33646796).

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

25575220 is a wasteful number, since it uses less digits than its factorization.

25575220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272 (or 1270 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 28.

The square root of 25575220 is about 5057.1948746316. The cubic root of 25575220 is about 294.6273951290.

It can be divided in two parts, 2557 and 5220, that added together give a palindrome (7777).

The spelling of 25575220 in words is "twenty-five million, five hundred seventy-five thousand, two hundred twenty".