25989540 has 96 divisors (see below), whose sum is σ = 78140160. Its totient is φ = 6437376.

The previous prime is 25989529. The next prime is 25989553. The reversal of 25989540 is 4598952.

It is a junction number, because it is equal to n+sod(n) for n = 25989492 and 25989501.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50806 + ... + 51314.

It is an arithmetic number, because the mean of its divisors is an integer number (813960).

Almost surely, 2^25989540 is an apocalyptic number.

25989540 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 25989540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39070080).

25989540 is an abundant number, since it is smaller than the sum of its proper divisors (52150620).

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

25989540 is a wasteful number, since it uses less digits than its factorization.

25989540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581 (or 579 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 25989540 is about 5097.9937230248. The cubic root of 25989540 is about 296.2098736801.

The spelling of 25989540 in words is "twenty-five million, nine hundred eighty-nine thousand, five hundred forty".