27724997 has 2 divisors, whose sum is σ = 27724998. Its totient is φ = 27724996.

The previous prime is 27724969. The next prime is 27725017. The reversal of 27724997 is 79942772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21242881 + 6482116 = 4609^2 + 2546^2 .

It is a cyclic number.

It is not a de Polignac number, because 27724997 - 2²⁰ = 26676421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27724967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13862498 + 13862499.

It is an arithmetic number, because the mean of its divisors is an integer number (13862499).

Almost surely, 2^27724997 is an apocalyptic number.

It is an amenable number.

27724997 is a deficient number, since it is larger than the sum of its proper divisors (1).

27724997 is an equidigital number, since it uses as much as digits as its factorization.

27724997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 47.

The square root of 27724997 is about 5265.4531618845. The cubic root of 27724997 is about 302.6614924422.

The spelling of 27724997 in words is "twenty-seven million, seven hundred twenty-four thousand, nine hundred ninety-seven".