27978763 has 2 divisors, whose sum is σ = 27978764. Its totient is φ = 27978762.

The previous prime is 27978749. The next prime is 27978779. The reversal of 27978763 is 36787972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27978763 - 2¹³ = 27970571 is a prime.

It is a super-2 number, since 2×27978763² = 1565622358020338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27978733) 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, 13989381 + 13989382.

It is an arithmetic number, because the mean of its divisors is an integer number (13989382).

Almost surely, 2^27978763 is an apocalyptic number.

27978763 is a deficient number, since it is larger than the sum of its proper divisors (1).

27978763 is an equidigital number, since it uses as much as digits as its factorization.

27978763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 49.

The square root of 27978763 is about 5289.4955336024. The cubic root of 27978763 is about 303.5821062937.

The spelling of 27978763 in words is "twenty-seven million, nine hundred seventy-eight thousand, seven hundred sixty-three".