27731789 has 2 divisors, whose sum is σ = 27731790. Its totient is φ = 27731788.

The previous prime is 27731771. The next prime is 27731797. The reversal of 27731789 is 98713772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22705225 + 5026564 = 4765^2 + 2242^2 .

It is a cyclic number.

It is not a de Polignac number, because 27731789 - 2⁸ = 27731533 is a prime.

It is a super-2 number, since 2×27731789² = 1538104242281042, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27731719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13865894 + 13865895.

It is an arithmetic number, because the mean of its divisors is an integer number (13865895).

Almost surely, 2^27731789 is an apocalyptic number.

It is an amenable number.

27731789 is a deficient number, since it is larger than the sum of its proper divisors (1).

27731789 is an equidigital number, since it uses as much as digits as its factorization.

27731789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 44.

The square root of 27731789 is about 5266.0980811223. The cubic root of 27731789 is about 302.6862055078.

The spelling of 27731789 in words is "twenty-seven million, seven hundred thirty-one thousand, seven hundred eighty-nine".