25281727128 has 80 divisors (see below), whose sum is σ = 80928294480. Its totient is φ = 7223349312.

The previous prime is 25281727127. The next prime is 25281727241. The reversal of 25281727128 is 82172718252.

It is a super-2 number, since 2×25281727128² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25281727127) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2782251 + ... + 2791322.

It is an arithmetic number, because the mean of its divisors is an integer number (1011603681).

Almost surely, 2^25281727128 is an apocalyptic number.

25281727128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25281727128 is an abundant number, since it is smaller than the sum of its proper divisors (55646567352).

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

25281727128 is a wasteful number, since it uses less digits than its factorization.

25281727128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5573598 (or 5573585 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The spelling of 25281727128 in words is "twenty-five billion, two hundred eighty-one million, seven hundred twenty-seven thousand, one hundred twenty-eight".