28587213 has 12 divisors (see below), whose sum is σ = 41609568. Its totient is φ = 18911880.

The previous prime is 28587203. The next prime is 28587253. The reversal of 28587213 is 31278582.

It is not a de Polignac number, because 28587213 - 2⁴ = 28587197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28587203) 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, 10945 + ... + 13302.

It is an arithmetic number, because the mean of its divisors is an integer number (3467464).

Almost surely, 2^28587213 is an apocalyptic number.

It is an amenable number.

28587213 is a deficient number, since it is larger than the sum of its proper divisors (13022355).

28587213 is a wasteful number, since it uses less digits than its factorization.

28587213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24384 (or 24381 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28587213 is about 5346.7011324741. The cubic root of 28587213 is about 305.7669955054.

The spelling of 28587213 in words is "twenty-eight million, five hundred eighty-seven thousand, two hundred thirteen".