27407795809 has 3 divisors (see below), whose sum is σ = 27407961363. Its totient is φ = 27407630256.

The previous prime is 27407795801. The next prime is 27407795893. The reversal of 27407795809 is 90859770472.

The square root of 27407795809 is 165553.

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., 3792712225 + 23615083584 = 61585^2 + 153672^2 .

It is not a de Polignac number, because 27407795809 - 2³ = 27407795801 is a prime.

It is a super-2 number, since 2×27407795809² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27407795801) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 82777 + ... + 248329.

It is an arithmetic number, because the mean of its divisors is an integer number (9135987121).

Almost surely, 2^27407795809 is an apocalyptic number.

27407795809 is the 165553-rd square number.

27407795809 is the 82777-th centered octagonal number.

It is an amenable number.

27407795809 is a deficient number, since it is larger than the sum of its proper divisors (165554).

27407795809 is an frugal number, since it uses more digits than its factorization.

27407795809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331106 (or 165553 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 58.

The spelling of 27407795809 in words is "twenty-seven billion, four hundred seven million, seven hundred ninety-five thousand, eight hundred nine".