28274933 has 4 divisors (see below), whose sum is σ = 28356300. Its totient is φ = 28193568.

The previous prime is 28274929. The next prime is 28274941. The reversal of 28274933 is 33947282.

It is a happy number.

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 25170289 + 3104644 = 5017^2 + 1762^2 .

It is a cyclic number.

It is not a de Polignac number, because 28274933 - 2² = 28274929 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 (28274923) 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, 40160 + ... + 40857.

It is an arithmetic number, because the mean of its divisors is an integer number (7089075).

Almost surely, 2^28274933 is an apocalyptic number.

It is an amenable number.

28274933 is a deficient number, since it is larger than the sum of its proper divisors (81367).

28274933 is an equidigital number, since it uses as much as digits as its factorization.

28274933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81366.

The product of its digits is 72576, while the sum is 38.

The square root of 28274933 is about 5317.4178884116. The cubic root of 28274933 is about 304.6495410244.

The spelling of 28274933 in words is "twenty-eight million, two hundred seventy-four thousand, nine hundred thirty-three".