27811708906 has 4 divisors (see below), whose sum is σ = 41717563362. Its totient is φ = 13905854452.

The previous prime is 27811708843. The next prime is 27811708927. The reversal of 27811708906 is 60980711872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 24471909225 + 3339799681 = 156435^2 + 57791^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 27811708906.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6952927225 + ... + 6952927228.

Almost surely, 2^27811708906 is an apocalyptic number.

27811708906 is a deficient number, since it is larger than the sum of its proper divisors (13905854456).

27811708906 is a wasteful number, since it uses less digits than its factorization.

27811708906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13905854455.

The product of its (nonzero) digits is 338688, while the sum is 49.

The spelling of 27811708906 in words is "twenty-seven billion, eight hundred eleven million, seven hundred eight thousand, nine hundred six".