28205133 has 32 divisors (see below), whose sum is σ = 43008000. Its totient is φ = 16286400.

The previous prime is 28205087. The next prime is 28205147. The reversal of 28205133 is 33150282.

It is not a de Polignac number, because 28205133 - 2⁹ = 28204621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28205173) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80643 + ... + 80991.

It is an arithmetic number, because the mean of its divisors is an integer number (1344000).

Almost surely, 2^28205133 is an apocalyptic number.

It is an amenable number.

28205133 is a deficient number, since it is larger than the sum of its proper divisors (14802867).

28205133 is a wasteful number, since it uses less digits than its factorization.

28205133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 28205133 is about 5310.8504968602. The cubic root of 28205133 is about 304.3986467074.

The spelling of 28205133 in words is "twenty-eight million, two hundred five thousand, one hundred thirty-three".