28428233 has 8 divisors (see below), whose sum is σ = 30214152. Its totient is φ = 26654976.

The previous prime is 28428227. The next prime is 28428251. The reversal of 28428233 is 33282482.

It can be written as a sum of positive squares in 4 ways, for example, as 1106704 + 27321529 = 1052^2 + 5227^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28428233 - 2⁴ = 28428217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28428233.

It is not an unprimeable number, because it can be changed into a prime (28428223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1691 + ... + 7727.

It is an arithmetic number, because the mean of its divisors is an integer number (3776769).

Almost surely, 2^28428233 is an apocalyptic number.

It is an amenable number.

28428233 is a deficient number, since it is larger than the sum of its proper divisors (1785919).

28428233 is a wasteful number, since it uses less digits than its factorization.

28428233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6331.

The product of its digits is 18432, while the sum is 32.

The square root of 28428233 is about 5331.8132938054. The cubic root of 28428233 is about 305.1991282289.

The spelling of 28428233 in words is "twenty-eight million, four hundred twenty-eight thousand, two hundred thirty-three".