25440990880 has 48 divisors (see below), whose sum is σ = 63267734880. Its totient is φ = 9640795392.

The previous prime is 25440990857. The next prime is 25440990881. The reversal of 25440990880 is 8809904452.

It is not an unprimeable number, because it can be changed into a prime (25440990881) 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, 4181334 + ... + 4187413.

It is an arithmetic number, because the mean of its divisors is an integer number (1318077810).

Almost surely, 2^25440990880 is an apocalyptic number.

25440990880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25440990880 is an abundant number, since it is smaller than the sum of its proper divisors (37826744000).

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

25440990880 is a wasteful number, since it uses less digits than its factorization.

25440990880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8368781 (or 8368773 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 25440990880 in words is "twenty-five billion, four hundred forty million, nine hundred ninety thousand, eight hundred eighty".