25090640 has 80 divisors (see below), whose sum is σ = 65085120. Its totient is φ = 8939520.

The previous prime is 25090627. The next prime is 25090669. The reversal of 25090640 is 4609052.

It is a tau number, because it is divible by the number of its divisors (80).

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, 25355 + ... + 26325.

It is an arithmetic number, because the mean of its divisors is an integer number (813564).

Almost surely, 2^25090640 is an apocalyptic number.

25090640 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 25090640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32542560).

25090640 is an abundant number, since it is smaller than the sum of its proper divisors (39994480).

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

25090640 is a wasteful number, since it uses less digits than its factorization.

25090640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1014 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 25090640 is about 5009.0557992500. The cubic root of 25090640 is about 292.7547249016.

Adding to 25090640 its reverse (4609052), we get a palindrome (29699692).

The spelling of 25090640 in words is "twenty-five million, ninety thousand, six hundred forty".