25704256220 has 12 divisors (see below), whose sum is σ = 53978938104. Its totient is φ = 10281702480.

The previous prime is 25704256219. The next prime is 25704256223. The reversal of 25704256220 is 2265240752.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25704256223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642606386 + ... + 642606425.

It is an arithmetic number, because the mean of its divisors is an integer number (4498244842).

Almost surely, 2^25704256220 is an apocalyptic number.

25704256220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25704256220 is an abundant number, since it is smaller than the sum of its proper divisors (28274681884).

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

25704256220 is a wasteful number, since it uses less digits than its factorization.

25704256220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285212820 (or 1285212818 counting only the distinct ones).

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

Adding to 25704256220 its reverse (2265240752), we get a palindrome (27969496972).

The spelling of 25704256220 in words is "twenty-five billion, seven hundred four million, two hundred fifty-six thousand, two hundred twenty".