28285749 has 6 divisors (see below), whose sum is σ = 40857206. Its totient is φ = 18857160.

The previous prime is 28285711. The next prime is 28285753. The reversal of 28285749 is 94758282.

It can be written as a sum of positive squares in only one way, i.e., 17514225 + 10771524 = 4185^2 + 3282^2 .

It is not a de Polignac number, because 28285749 - 2¹⁷ = 28154677 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 (28285799) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1571422 + ... + 1571439.

Almost surely, 2^28285749 is an apocalyptic number.

It is an amenable number.

28285749 is a deficient number, since it is larger than the sum of its proper divisors (12571457).

28285749 is a wasteful number, since it uses less digits than its factorization.

28285749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142867 (or 3142864 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 28285749 is about 5318.4348261495. The cubic root of 28285749 is about 304.6883818988.

The spelling of 28285749 in words is "twenty-eight million, two hundred eighty-five thousand, seven hundred forty-nine".