25220400 has 60 divisors (see below), whose sum is σ = 80793192. Its totient is φ = 6725120.

The previous prime is 25220399. The next prime is 25220417. The reversal of 25220400 is 402252.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 25220400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9309 + ... + 11708.

Almost surely, 2^25220400 is an apocalyptic number.

25220400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25220400 is an abundant number, since it is smaller than the sum of its proper divisors (55572792).

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

25220400 is a wasteful number, since it uses less digits than its factorization.

25220400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21038 (or 21027 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 25220400 is about 5021.9916367911. The cubic root of 25220400 is about 293.2585323504.

Adding to 25220400 its reverse (402252), we get a palindrome (25622652).

The spelling of 25220400 in words is "twenty-five million, two hundred twenty thousand, four hundred".