25497240 has 128 divisors (see below), whose sum is σ = 82425600. Its totient is φ = 6289920.

The previous prime is 25497239. The next prime is 25497281. The reversal of 25497240 is 4279452.

It is a congruent number.

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, 120735 + ... + 120945.

It is an arithmetic number, because the mean of its divisors is an integer number (643950).

Almost surely, 2^25497240 is an apocalyptic number.

25497240 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 25497240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41212800).

25497240 is an abundant number, since it is smaller than the sum of its proper divisors (56928360).

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

25497240 is a wasteful number, since it uses less digits than its factorization.

25497240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 25497240 is about 5049.4791810641. The cubic root of 25497240 is about 294.3276461981.

The spelling of 25497240 in words is "twenty-five million, four hundred ninety-seven thousand, two hundred forty".