27790817 has 2 divisors, whose sum is σ = 27790818. Its totient is φ = 27790816.

The previous prime is 27790813. The next prime is 27790837. The reversal of 27790817 is 71809772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 7639696 = 4489^2 + 2764^2 .

It is a cyclic number.

It is not a de Polignac number, because 27790817 - 2² = 27790813 is a prime.

It is not a weakly prime, because it can be changed into another prime (27790813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13895408 + 13895409.

It is an arithmetic number, because the mean of its divisors is an integer number (13895409).

Almost surely, 2^27790817 is an apocalyptic number.

It is an amenable number.

27790817 is a deficient number, since it is larger than the sum of its proper divisors (1).

27790817 is an equidigital number, since it uses as much as digits as its factorization.

27790817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 27790817 is about 5271.6996310488. The cubic root of 27790817 is about 302.9008124043.

The spelling of 27790817 in words is "twenty-seven million, seven hundred ninety thousand, eight hundred seventeen".