25989386240 has 52 divisors (see below), whose sum is σ = 62366962044. Its totient is φ = 10395746304.

The previous prime is 25989386219. The next prime is 25989386281. The reversal of 25989386240 is 4268398952.

It can be written as a sum of positive squares in 2 ways, for example, as 13702107136 + 12287279104 = 117056^2 + 110848^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614027 + ... + 654986.

Almost surely, 2^25989386240 is an apocalyptic number.

25989386240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25989386240 is an abundant number, since it is smaller than the sum of its proper divisors (36377575804).

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

25989386240 is an equidigital number, since it uses as much as digits as its factorization.

25989386240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269042 (or 1269020 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 25989386240 in words is "twenty-five billion, nine hundred eighty-nine million, three hundred eighty-six thousand, two hundred forty".