28331893 has 2 divisors, whose sum is σ = 28331894. Its totient is φ = 28331892.

The previous prime is 28331881. The next prime is 28331939. The reversal of 28331893 is 39813382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24423364 + 3908529 = 4942^2 + 1977^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28331893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28331803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14165946 + 14165947.

It is an arithmetic number, because the mean of its divisors is an integer number (14165947).

Almost surely, 2^28331893 is an apocalyptic number.

It is an amenable number.

28331893 is a deficient number, since it is larger than the sum of its proper divisors (1).

28331893 is an equidigital number, since it uses as much as digits as its factorization.

28331893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 28331893 is about 5322.7711767462. The cubic root of 28331893 is about 304.8539765034.

The spelling of 28331893 in words is "twenty-eight million, three hundred thirty-one thousand, eight hundred ninety-three".