25420241440 has 144 divisors (see below), whose sum is σ = 69895137816. Its totient is φ = 8699863040.

The previous prime is 25420241419. The next prime is 25420241467. The reversal of 25420241440 is 4414202452.

It can be written as a sum of positive squares in 4 ways, for example, as 14972948496 + 10447292944 = 122364^2 + 102212^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25420241399 and 25420241408.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 290502 + ... + 367738.

Almost surely, 2^25420241440 is an apocalyptic number.

25420241440 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 25420241440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34947568908).

25420241440 is an abundant number, since it is smaller than the sum of its proper divisors (44474896376).

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

25420241440 is a wasteful number, since it uses less digits than its factorization.

25420241440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77291 (or 77272 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 28.

Adding to 25420241440 its reverse (4414202452), we get a palindrome (29834443892).

The spelling of 25420241440 in words is "twenty-five billion, four hundred twenty million, two hundred forty-one thousand, four hundred forty".