27129805 has 16 divisors (see below), whose sum is σ = 33767424. Its totient is φ = 20903040.

The previous prime is 27129779. The next prime is 27129827. The reversal of 27129805 is 50892172.

It is not a de Polignac number, because 27129805 - 2¹¹ = 27127757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59137 + ... + 59593.

It is an arithmetic number, because the mean of its divisors is an integer number (2110464).

Almost surely, 2^27129805 is an apocalyptic number.

It is an amenable number.

27129805 is a deficient number, since it is larger than the sum of its proper divisors (6637619).

27129805 is a wasteful number, since it uses less digits than its factorization.

27129805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 27129805 is about 5208.6279383346. The cubic root of 27129805 is about 300.4799908789.

The spelling of 27129805 in words is "twenty-seven million, one hundred twenty-nine thousand, eight hundred five".