28394285 has 8 divisors (see below), whose sum is σ = 34119576. Its totient is φ = 22684480.

The previous prime is 28394257. The next prime is 28394287. The reversal of 28394285 is 58249382.

It can be written as a sum of positive squares in 4 ways, for example, as 2149156 + 26245129 = 1466^2 + 5123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28394285 is a prime.

It is a super-2 number, since 2×28394285² = 1612470841322450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28394287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647 + ... + 7563.

It is an arithmetic number, because the mean of its divisors is an integer number (4264947).

Almost surely, 2^28394285 is an apocalyptic number.

It is an amenable number.

28394285 is a deficient number, since it is larger than the sum of its proper divisors (5725291).

28394285 is an equidigital number, since it uses as much as digits as its factorization.

28394285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7743.

The product of its digits is 138240, while the sum is 41.

The square root of 28394285 is about 5328.6288104915. The cubic root of 28394285 is about 305.0775938027.

The spelling of 28394285 in words is "twenty-eight million, three hundred ninety-four thousand, two hundred eighty-five".