27723281 has 2 divisors, whose sum is σ = 27723282. Its totient is φ = 27723280.

The previous prime is 27723259. The next prime is 27723313. The reversal of 27723281 is 18232772.

It is an a-pointer prime, because the next prime (27723313) can be obtained adding 27723281 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26884225 + 839056 = 5185^2 + 916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27723281 is a prime.

It is a super-2 number, since 2×27723281² = 1537160618809922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27723221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13861640 + 13861641.

It is an arithmetic number, because the mean of its divisors is an integer number (13861641).

Almost surely, 2^27723281 is an apocalyptic number.

It is an amenable number.

27723281 is a deficient number, since it is larger than the sum of its proper divisors (1).

27723281 is an equidigital number, since it uses as much as digits as its factorization.

27723281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 27723281 is about 5265.2902104253. The cubic root of 27723281 is about 302.6552480431.

The spelling of 27723281 in words is "twenty-seven million, seven hundred twenty-three thousand, two hundred eighty-one".