28358213 has 8 divisors (see below), whose sum is σ = 30634968. Its totient is φ = 26095104.

The previous prime is 28358191. The next prime is 28358257. The reversal of 28358213 is 31285382.

It can be written as a sum of positive squares in 4 ways, for example, as 247009 + 28111204 = 497^2 + 5302^2 .

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 28358213 - 2¹⁴ = 28341829 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28358213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28358263) 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, 1145 + ... + 7617.

It is an arithmetic number, because the mean of its divisors is an integer number (3829371).

Almost surely, 2^28358213 is an apocalyptic number.

It is an amenable number.

28358213 is a deficient number, since it is larger than the sum of its proper divisors (2276755).

28358213 is a wasteful number, since it uses less digits than its factorization.

28358213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6823.

The product of its digits is 11520, while the sum is 32.

The square root of 28358213 is about 5325.2429991504. The cubic root of 28358213 is about 304.9483492219.

The spelling of 28358213 in words is "twenty-eight million, three hundred fifty-eight thousand, two hundred thirteen".