27697997 has 2 divisors, whose sum is σ = 27697998. Its totient is φ = 27697996.

The previous prime is 27697979. The next prime is 27698053. The reversal of 27697997 is 79979672.

Together with previous prime (27697979) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (27698053) can be obtained adding 27697997 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14945956 + 12752041 = 3866^2 + 3571^2 .

It is a cyclic number.

It is not a de Polignac number, because 27697997 - 2¹⁸ = 27435853 is a prime.

It is a super-3 number, since 3×27697997³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27697297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13848998 + 13848999.

It is an arithmetic number, because the mean of its divisors is an integer number (13848999).

Almost surely, 2^27697997 is an apocalyptic number.

It is an amenable number.

27697997 is a deficient number, since it is larger than the sum of its proper divisors (1).

27697997 is an equidigital number, since it uses as much as digits as its factorization.

27697997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000564, while the sum is 56.

The square root of 27697997 is about 5262.8886554819. Note that the first 3 decimals coincide. The cubic root of 27697997 is about 302.5632115244.

The spelling of 27697997 in words is "twenty-seven million, six hundred ninety-seven thousand, nine hundred ninety-seven".