28910893 has 12 divisors (see below), whose sum is σ = 31917340. Its totient is φ = 26167680.

The previous prime is 28910887. The next prime is 28910899. The reversal of 28910893 is 39801982.

It is an interprime number because it is at equal distance from previous prime (28910887) and next prime (28910899).

It can be written as a sum of positive squares in 2 ways, for example, as 5697769 + 23213124 = 2387^2 + 4818^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28910893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28910899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40423 + ... + 41131.

Almost surely, 2^28910893 is an apocalyptic number.

It is an amenable number.

28910893 is a deficient number, since it is larger than the sum of its proper divisors (3006447).

28910893 is a wasteful number, since it uses less digits than its factorization.

28910893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068 (or 1057 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 28910893 is about 5376.8850647936. The cubic root of 28910893 is about 306.9166873846.

The spelling of 28910893 in words is "twenty-eight million, nine hundred ten thousand, eight hundred ninety-three".