28333945 has 4 divisors (see below), whose sum is σ = 34000740. Its totient is φ = 22667152.

The previous prime is 28333939. The next prime is 28333967. The reversal of 28333945 is 54933382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13155129 + 15178816 = 3627^2 + 3896^2 .

It is a cyclic number.

It is not a de Polignac number, because 28333945 - 2³ = 28333937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2833390 + ... + 2833399.

It is an arithmetic number, because the mean of its divisors is an integer number (8500185).

Almost surely, 2^28333945 is an apocalyptic number.

It is an amenable number.

28333945 is a deficient number, since it is larger than the sum of its proper divisors (5666795).

28333945 is an equidigital number, since it uses as much as digits as its factorization.

28333945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666794.

The product of its digits is 77760, while the sum is 37.

The square root of 28333945 is about 5322.9639299924. The cubic root of 28333945 is about 304.8613362335.

The spelling of 28333945 in words is "twenty-eight million, three hundred thirty-three thousand, nine hundred forty-five".