25220000 has 120 divisors (see below), whose sum is σ = 67506516. Its totient is φ = 9216000.

The previous prime is 25219991. The next prime is 25220033. The reversal of 25220000 is 2252.

It can be written as a sum of positive squares in 10 ways, for example, as 5895184 + 19324816 = 2428^2 + 4396^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 259952 + ... + 260048.

Almost surely, 2^25220000 is an apocalyptic number.

25220000 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 25220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33753258).

25220000 is an abundant number, since it is smaller than the sum of its proper divisors (42286516).

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

25220000 is an equidigital number, since it uses as much as digits as its factorization.

25220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 25220000 is about 5021.9518117959. The cubic root of 25220000 is about 293.2569819649.

Adding to 25220000 its reverse (2252), we get a palindrome (25222252).

The spelling of 25220000 in words is "twenty-five million, two hundred twenty thousand".