28018733 has 2 divisors, whose sum is σ = 28018734. Its totient is φ = 28018732.

The previous prime is 28018729. The next prime is 28018747. The reversal of 28018733 is 33781082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23059204 + 4959529 = 4802^2 + 2227^2 .

It is a cyclic number.

It is not a de Polignac number, because 28018733 - 2² = 28018729 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28018733.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28018723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14009366 + 14009367.

It is an arithmetic number, because the mean of its divisors is an integer number (14009367).

Almost surely, 2^28018733 is an apocalyptic number.

It is an amenable number.

28018733 is a deficient number, since it is larger than the sum of its proper divisors (1).

28018733 is an equidigital number, since it uses as much as digits as its factorization.

28018733 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 28018733 is about 5293.2724282810. The cubic root of 28018733 is about 303.7266016400.

The spelling of 28018733 in words is "twenty-eight million, eighteen thousand, seven hundred thirty-three".