28544693 has 2 divisors, whose sum is σ = 28544694. Its totient is φ = 28544692.

The previous prime is 28544657. The next prime is 28544743. The reversal of 28544693 is 39644582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16834609 + 11710084 = 4103^2 + 3422^2 .

It is a cyclic number.

It is not a de Polignac number, because 28544693 - 2⁶ = 28544629 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28544693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28544603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14272346 + 14272347.

It is an arithmetic number, because the mean of its divisors is an integer number (14272347).

Almost surely, 2^28544693 is an apocalyptic number.

It is an amenable number.

28544693 is a deficient number, since it is larger than the sum of its proper divisors (1).

28544693 is an equidigital number, since it uses as much as digits as its factorization.

28544693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 41.

The square root of 28544693 is about 5342.7233692191. The cubic root of 28544693 is about 305.6153232188.

The spelling of 28544693 in words is "twenty-eight million, five hundred forty-four thousand, six hundred ninety-three".