27719897 has 2 divisors, whose sum is σ = 27719898. Its totient is φ = 27719896.

The previous prime is 27719893. The next prime is 27719929. The reversal of 27719897 is 79891772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27709696 + 10201 = 5264^2 + 101^2 .

It is a cyclic number.

It is not a de Polignac number, because 27719897 - 2² = 27719893 is a prime.

It is not a weakly prime, because it can be changed into another prime (27719893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13859948 + 13859949.

It is an arithmetic number, because the mean of its divisors is an integer number (13859949).

Almost surely, 2^27719897 is an apocalyptic number.

It is an amenable number.

27719897 is a deficient number, since it is larger than the sum of its proper divisors (1).

27719897 is an equidigital number, since it uses as much as digits as its factorization.

27719897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 50.

The square root of 27719897 is about 5264.9688508100. The cubic root of 27719897 is about 302.6429331583.

The spelling of 27719897 in words is "twenty-seven million, seven hundred nineteen thousand, eight hundred ninety-seven".