25440528648 has 32 divisors (see below), whose sum is σ = 66948760800. Its totient is φ = 8033851008.

The previous prime is 25440528623. The next prime is 25440528649. The reversal of 25440528648 is 84682504452.

It is a junction number, because it is equal to n+sod(n) for n = 25440528597 and 25440528606.

It is not an unprimeable number, because it can be changed into a prime (25440528649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27894861 + ... + 27895772.

It is an arithmetic number, because the mean of its divisors is an integer number (2092148775).

Almost surely, 2^25440528648 is an apocalyptic number.

It is an amenable number.

25440528648 is an abundant number, since it is smaller than the sum of its proper divisors (41508232152).

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

25440528648 is a wasteful number, since it uses less digits than its factorization.

25440528648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55790661 (or 55790657 counting only the distinct ones).

The product of its (nonzero) digits is 2457600, while the sum is 48.

The spelling of 25440528648 in words is "twenty-five billion, four hundred forty million, five hundred twenty-eight thousand, six hundred forty-eight".