27967789 has 2 divisors, whose sum is σ = 27967790. Its totient is φ = 27967788.

The previous prime is 27967787. The next prime is 27967799. The reversal of 27967789 is 98776972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19873764 + 8094025 = 4458^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 27967789 - 2¹ = 27967787 is a prime.

Together with 27967787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27967783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13983894 + 13983895.

It is an arithmetic number, because the mean of its divisors is an integer number (13983895).

Almost surely, 2^27967789 is an apocalyptic number.

It is an amenable number.

27967789 is a deficient number, since it is larger than the sum of its proper divisors (1).

27967789 is an equidigital number, since it uses as much as digits as its factorization.

27967789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2667168, while the sum is 55.

The square root of 27967789 is about 5288.4580928660. The cubic root of 27967789 is about 303.5424101654.

It can be divided in two parts, 2796 and 7789, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 27967789 in words is "twenty-seven million, nine hundred sixty-seven thousand, seven hundred eighty-nine".