27954836809 has 3 divisors (see below), whose sum is σ = 27955004007. Its totient is φ = 27954669612.

The previous prime is 27954836807. The next prime is 27954836813. The reversal of 27954836809 is 90863845972.

The square root of 27954836809 is 167197.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 18345348025 + 9609488784 = 135445^2 + 98028^2 .

It is not a de Polignac number, because 27954836809 - 2¹ = 27954836807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27954836807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 83599 + ... + 250795.

It is an arithmetic number, because the mean of its divisors is an integer number (9318334669).

Almost surely, 2^27954836809 is an apocalyptic number.

27954836809 is the 167197-th square number.

27954836809 is the 83599-th centered octagonal number.

It is an amenable number.

27954836809 is a deficient number, since it is larger than the sum of its proper divisors (167198).

27954836809 is an frugal number, since it uses more digits than its factorization.

27954836809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334394 (or 167197 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 27954836809 in words is "twenty-seven billion, nine hundred fifty-four million, eight hundred thirty-six thousand, eight hundred nine".