28075213 has 8 divisors (see below), whose sum is σ = 28697976. Its totient is φ = 27456000.

The previous prime is 28075207. The next prime is 28075231. The reversal of 28075213 is 31257082.

It can be written as a sum of positive squares in 4 ways, for example, as 22401289 + 5673924 = 4733^2 + 2382^2 .

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-28075213 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 (28075253) 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 7 ways as a sum of consecutive naturals, for example, 20593 + ... + 21913.

It is an arithmetic number, because the mean of its divisors is an integer number (3587247).

Almost surely, 2^28075213 is an apocalyptic number.

It is an amenable number.

28075213 is a deficient number, since it is larger than the sum of its proper divisors (622763).

28075213 is a wasteful number, since it uses less digits than its factorization.

28075213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 28075213 is about 5298.6048163644. The cubic root of 28075213 is about 303.9305481058.

The spelling of 28075213 in words is "twenty-eight million, seventy-five thousand, two hundred thirteen".