28118693 has 2 divisors, whose sum is σ = 28118694. Its totient is φ = 28118692.

The previous prime is 28118683. The next prime is 28118729. The reversal of 28118693 is 39681182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21883684 + 6235009 = 4678^2 + 2497^2 .

It is a cyclic number.

It is not a de Polignac number, because 28118693 - 2⁴ = 28118677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28118653) 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, 14059346 + 14059347.

It is an arithmetic number, because the mean of its divisors is an integer number (14059347).

Almost surely, 2^28118693 is an apocalyptic number.

It is an amenable number.

28118693 is a deficient number, since it is larger than the sum of its proper divisors (1).

28118693 is an equidigital number, since it uses as much as digits as its factorization.

28118693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 28118693 is about 5302.7061958966. The cubic root of 28118693 is about 304.0873659619.

The spelling of 28118693 in words is "twenty-eight million, one hundred eighteen thousand, six hundred ninety-three".