27775813 has 4 divisors (see below), whose sum is σ = 29912428. Its totient is φ = 25639200.

The previous prime is 27775771. The next prime is 27775817. The reversal of 27775813 is 31857772.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14577124 + 13198689 = 3818^2 + 3633^2 .

It is a cyclic number.

It is not a de Polignac number, because 27775813 - 2²¹ = 25678661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27775817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068288 + ... + 1068313.

It is an arithmetic number, because the mean of its divisors is an integer number (7478107).

Almost surely, 2^27775813 is an apocalyptic number.

It is an amenable number.

27775813 is a deficient number, since it is larger than the sum of its proper divisors (2136615).

27775813 is a wasteful number, since it uses less digits than its factorization.

27775813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136614.

The product of its digits is 82320, while the sum is 40.

The square root of 27775813 is about 5270.2763684649. The cubic root of 27775813 is about 302.8462914940.

The spelling of 27775813 in words is "twenty-seven million, seven hundred seventy-five thousand, eight hundred thirteen".