27128929 has 2 divisors, whose sum is σ = 27128930. Its totient is φ = 27128928.

The previous prime is 27128911. The next prime is 27128939. The reversal of 27128929 is 92982172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22515025 + 4613904 = 4745^2 + 2148^2 .

It is a cyclic number.

It is not a de Polignac number, because 27128929 - 2⁵ = 27128897 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27128891 and 27128900.

It is not a weakly prime, because it can be changed into another prime (27128909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13564464 + 13564465.

It is an arithmetic number, because the mean of its divisors is an integer number (13564465).

Almost surely, 2^27128929 is an apocalyptic number.

It is an amenable number.

27128929 is a deficient number, since it is larger than the sum of its proper divisors (1).

27128929 is an equidigital number, since it uses as much as digits as its factorization.

27128929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 27128929 is about 5208.5438464124. The cubic root of 27128929 is about 300.4767567568.

The spelling of 27128929 in words is "twenty-seven million, one hundred twenty-eight thousand, nine hundred twenty-nine".