28018937 has 2 divisors, whose sum is σ = 28018938. Its totient is φ = 28018936.

The previous prime is 28018919. The next prime is 28018957. The reversal of 28018937 is 73981082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24393721 + 3625216 = 4939^2 + 1904^2 .

It is a cyclic number.

It is not a de Polignac number, because 28018937 - 2⁸ = 28018681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28018937.

It is not a weakly prime, because it can be changed into another prime (28018957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14009468 + 14009469.

It is an arithmetic number, because the mean of its divisors is an integer number (14009469).

Almost surely, 2^28018937 is an apocalyptic number.

It is an amenable number.

28018937 is a deficient number, since it is larger than the sum of its proper divisors (1).

28018937 is an equidigital number, since it uses as much as digits as its factorization.

28018937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28018937 is about 5293.2916979891. The cubic root of 28018937 is about 303.7273387668.

The spelling of 28018937 in words is "twenty-eight million, eighteen thousand, nine hundred thirty-seven".