27128372789 has 12 divisors (see below), whose sum is σ = 32327192268. Its totient is φ = 22685745600.

The previous prime is 27128372783. The next prime is 27128372801. The reversal of 27128372789 is 98727382172.

It can be written as a sum of positive squares in 2 ways, for example, as 2719622500 + 24408750289 = 52150^2 + 156233^2 .

It is not a de Polignac number, because 27128372789 - 2⁴ = 27128372773 is a prime.

It is a super-2 number, since 2×27128372789² (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 (27128372783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6749702 + ... + 6753719.

It is an arithmetic number, because the mean of its divisors is an integer number (2693932689).

Almost surely, 2^27128372789 is an apocalyptic number.

It is an amenable number.

27128372789 is a deficient number, since it is larger than the sum of its proper divisors (5198819479).

27128372789 is a wasteful number, since it uses less digits than its factorization.

27128372789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13503476 (or 13503469 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 56.

The spelling of 27128372789 in words is "twenty-seven billion, one hundred twenty-eight million, three hundred seventy-two thousand, seven hundred eighty-nine".