27739150639209 has 9 divisors (see below), whose sum is σ = 40067684857213. Its totient is φ = 18492756559212.

The previous prime is 27739150639201. The next prime is 27739150639223. The reversal of 27739150639209 is 90293605193772.

The square root of 27739150639209 is 5266797.

It is a perfect power (a square), and thus also a powerful number.

27739150639209 is a `hidden beast` number, since 2 + 7 + 7 + 3 + 91 + 506 + 39 + 2 + 0 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 27739150639209 - 2³ = 27739150639201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27739150639201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14922592 + ... + 16678190.

Almost surely, 2^{27739150639209} is an apocalyptic number.

27739150639209 is the 5266797-th square number.

27739150639209 is the 2633399-th centered octagonal number.

It is an amenable number.

27739150639209 is a deficient number, since it is larger than the sum of its proper divisors (12328534218004).

27739150639209 is an frugal number, since it uses more digits than its factorization.

27739150639209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3511204 (or 1755602 counting only the distinct ones).

The product of its (nonzero) digits is 38578680, while the sum is 63.

The spelling of 27739150639209 in words is "twenty-seven trillion, seven hundred thirty-nine billion, one hundred fifty million, six hundred thirty-nine thousand, two hundred nine".