27129779 has 2 divisors, whose sum is σ = 27129780. Its totient is φ = 27129778.

The previous prime is 27129737. The next prime is 27129827. The reversal of 27129779 is 97792172.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27129779 - 2⁸ = 27129523 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (27129709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13564889 + 13564890.

It is an arithmetic number, because the mean of its divisors is an integer number (13564890).

Almost surely, 2^27129779 is an apocalyptic number.

27129779 is a deficient number, since it is larger than the sum of its proper divisors (1).

27129779 is an equidigital number, since it uses as much as digits as its factorization.

27129779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111132, while the sum is 44.

The square root of 27129779 is about 5208.6254424752. The cubic root of 27129779 is about 300.4798948899.

The spelling of 27129779 in words is "twenty-seven million, one hundred twenty-nine thousand, seven hundred seventy-nine".