25438283720 has 32 divisors (see below), whose sum is σ = 58020201720. Its totient is φ = 10035924480.

The previous prime is 25438283671. The next prime is 25438283723. The reversal of 25438283720 is 2738283452.

It can be written as a sum of positive squares in 4 ways, for example, as 13795442116 + 11642841604 = 117454^2 + 107902^2 .

It is not an unprimeable number, because it can be changed into a prime (25438283723) 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, 4352951 + ... + 4358790.

Almost surely, 2^25438283720 is an apocalyptic number.

25438283720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25438283720 is an abundant number, since it is smaller than the sum of its proper divisors (32581918000).

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

25438283720 is a wasteful number, since it uses less digits than its factorization.

25438283720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8711825 (or 8711821 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 44.

The spelling of 25438283720 in words is "twenty-five billion, four hundred thirty-eight million, two hundred eighty-three thousand, seven hundred twenty".