28865213 has 8 divisors (see below), whose sum is σ = 31130400. Its totient is φ = 26606448.

The previous prime is 28865203. The next prime is 28865227. The reversal of 28865213 is 31256882.

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

It is a cyclic number.

It is not a de Polignac number, because 28865213 - 2⁴ = 28865197 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 (28865203) 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, 12158 + ... + 14336.

It is an arithmetic number, because the mean of its divisors is an integer number (3891300).

Almost surely, 2^28865213 is an apocalyptic number.

It is an amenable number.

28865213 is a deficient number, since it is larger than the sum of its proper divisors (2265187).

28865213 is a wasteful number, since it uses less digits than its factorization.

28865213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211.

The product of its digits is 23040, while the sum is 35.

The square root of 28865213 is about 5372.6355729753. The cubic root of 28865213 is about 306.7549565941.

The spelling of 28865213 in words is "twenty-eight million, eight hundred sixty-five thousand, two hundred thirteen".