25205440 has 112 divisors (see below), whose sum is σ = 66312288. Its totient is φ = 9068544.

The previous prime is 25205431. The next prime is 25205461. The reversal of 25205440 is 4450252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303639 + ... + 303721.

It is an arithmetic number, because the mean of its divisors is an integer number (592074).

Almost surely, 2^25205440 is an apocalyptic number.

25205440 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 25205440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33156144).

25205440 is an abundant number, since it is smaller than the sum of its proper divisors (41106848).

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

25205440 is a wasteful number, since it uses less digits than its factorization.

25205440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 25205440 is about 5020.5019669352. The cubic root of 25205440 is about 293.2005367679.

Adding to 25205440 its reverse (4450252), we get a palindrome (29655692).

The spelling of 25205440 in words is "twenty-five million, two hundred five thousand, four hundred forty".