25730440 has 48 divisors (see below), whose sum is σ = 59264100. Its totient is φ = 10053888.

The previous prime is 25730437. The next prime is 25730449. The reversal of 25730440 is 4403752.

It can be written as a sum of positive squares in 6 ways, for example, as 22410756 + 3319684 = 4734^2 + 1822^2 .

It is not an unprimeable number, because it can be changed into a prime (25730449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112246 + ... + 112474.

Almost surely, 2^25730440 is an apocalyptic number.

25730440 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 25730440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29632050).

25730440 is an abundant number, since it is smaller than the sum of its proper divisors (33533660).

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

25730440 is a wasteful number, since it uses less digits than its factorization.

25730440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 25730440 is about 5072.5181123383. The cubic root of 25730440 is about 295.2222398865. Note that the first 4 decimals are identical.

The spelling of 25730440 in words is "twenty-five million, seven hundred thirty thousand, four hundred forty".