25409220 has 96 divisors (see below), whose sum is σ = 78019200. Its totient is φ = 6150144.

The previous prime is 25409171. The next prime is 25409221. The reversal of 25409220 is 2290452.

It is a super-2 number, since 2×25409220² = 1291256922016800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25409221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29151 + ... + 30009.

It is an arithmetic number, because the mean of its divisors is an integer number (812700).

Almost surely, 2^25409220 is an apocalyptic number.

25409220 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 25409220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39009600).

25409220 is an abundant number, since it is smaller than the sum of its proper divisors (52609980).

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

25409220 is a wasteful number, since it uses less digits than its factorization.

25409220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 915 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 25409220 is about 5040.7558956966. The cubic root of 25409220 is about 293.9885691331.

Adding to 25409220 its reverse (2290452), we get a palindrome (27699672).

The spelling of 25409220 in words is "twenty-five million, four hundred nine thousand, two hundred twenty".