28258213 has 8 divisors (see below), whose sum is σ = 28748736. Its totient is φ = 27770400.

The previous prime is 28258207. The next prime is 28258231. The reversal of 28258213 is 31285282.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28258213 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 (28258253) 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, 36753 + ... + 37513.

It is an arithmetic number, because the mean of its divisors is an integer number (3593592).

Almost surely, 2^28258213 is an apocalyptic number.

It is an amenable number.

28258213 is a deficient number, since it is larger than the sum of its proper divisors (490523).

28258213 is an equidigital number, since it uses as much as digits as its factorization.

28258213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355.

The product of its digits is 7680, while the sum is 31.

The square root of 28258213 is about 5315.8454642700. The cubic root of 28258213 is about 304.5894790525.

The spelling of 28258213 in words is "twenty-eight million, two hundred fifty-eight thousand, two hundred thirteen".