28093213 has 4 divisors (see below), whose sum is σ = 28265728. Its totient is φ = 27920700.

The previous prime is 28093211. The next prime is 28093243. The reversal of 28093213 is 31239082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28093213 - 2¹ = 28093211 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 (28093211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86013 + ... + 86338.

It is an arithmetic number, because the mean of its divisors is an integer number (7066432).

Almost surely, 2^28093213 is an apocalyptic number.

It is an amenable number.

28093213 is a deficient number, since it is larger than the sum of its proper divisors (172515).

28093213 is a wasteful number, since it uses less digits than its factorization.

28093213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172514.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 28093213 is about 5300.3031045403. The cubic root of 28093213 is about 303.9954877273.

The spelling of 28093213 in words is "twenty-eight million, ninety-three thousand, two hundred thirteen".