28000393 has 2 divisors, whose sum is σ = 28000394. Its totient is φ = 28000392.

The previous prime is 28000381. The next prime is 28000421. The reversal of 28000393 is 39300082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27846729 + 153664 = 5277^2 + 392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28000393 is a prime.

It is not a weakly prime, because it can be changed into another prime (28000363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14000196 + 14000197.

It is an arithmetic number, because the mean of its divisors is an integer number (14000197).

Almost surely, 2^28000393 is an apocalyptic number.

It is an amenable number.

28000393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28000393 is an equidigital number, since it uses as much as digits as its factorization.

28000393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 28000393 is about 5291.5397570084. The cubic root of 28000393 is about 303.6603178708.

The spelling of 28000393 in words is "twenty-eight million, three hundred ninety-three", and thus it is an aban number.