28500433 has 4 divisors (see below), whose sum is σ = 30692788. Its totient is φ = 26308080.

The previous prime is 28500401. The next prime is 28500463. The reversal of 28500433 is 33400582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33400582 = 2 ⋅16700291.

It can be written as a sum of positive squares in 2 ways, for example, as 18464209 + 10036224 = 4297^2 + 3168^2 .

It is a cyclic number.

It is not a de Polignac number, because 28500433 - 2⁵ = 28500401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28500398 and 28500407.

It is not an unprimeable number, because it can be changed into a prime (28500463) 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 3 ways as a sum of consecutive naturals, for example, 1096158 + ... + 1096183.

It is an arithmetic number, because the mean of its divisors is an integer number (7673197).

Almost surely, 2^28500433 is an apocalyptic number.

It is an amenable number.

28500433 is a deficient number, since it is larger than the sum of its proper divisors (2192355).

28500433 is a wasteful number, since it uses less digits than its factorization.

28500433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192354.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 28500433 is about 5338.5796800273. The cubic root of 28500433 is about 305.4572841345.

The spelling of 28500433 in words is "twenty-eight million, five hundred thousand, four hundred thirty-three".