28303633 has 4 divisors (see below), whose sum is σ = 28691428. Its totient is φ = 27915840.

The previous prime is 28303621. The next prime is 28303637. The reversal of 28303633 is 33630382.

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 20502784 + 7800849 = 4528^2 + 2793^2 .

It is a cyclic number.

It is not a de Polignac number, because 28303633 - 2¹³ = 28295441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28303637) 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, 193788 + ... + 193933.

It is an arithmetic number, because the mean of its divisors is an integer number (7172857).

Almost surely, 2^28303633 is an apocalyptic number.

It is an amenable number.

28303633 is a deficient number, since it is larger than the sum of its proper divisors (387795).

28303633 is an equidigital number, since it uses as much as digits as its factorization.

28303633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387794.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 28303633 is about 5320.1158821966. The cubic root of 28303633 is about 304.7525826502.

The spelling of 28303633 in words is "twenty-eight million, three hundred three thousand, six hundred thirty-three".