25304157440 has 144 divisors (see below), whose sum is σ = 64238832000. Its totient is φ = 9523224576.

The previous prime is 25304157413. The next prime is 25304157443. The reversal of 25304157440 is 4475140352.

It is a self number, because there is not a number n which added to its sum of digits gives 25304157440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25304157443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3620189 + ... + 3627171.

It is an arithmetic number, because the mean of its divisors is an integer number (446103000).

Almost surely, 2^25304157440 is an apocalyptic number.

25304157440 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 25304157440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32119416000).

25304157440 is an abundant number, since it is smaller than the sum of its proper divisors (38934674560).

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

25304157440 is a wasteful number, since it uses less digits than its factorization.

25304157440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7172 (or 7158 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 35.

Adding to 25304157440 its reverse (4475140352), we get a palindrome (29779297792).

The spelling of 25304157440 in words is "twenty-five billion, three hundred four million, one hundred fifty-seven thousand, four hundred forty".