28885733 has 4 divisors (see below), whose sum is σ = 28897740. Its totient is φ = 28873728.

The previous prime is 28885721. The next prime is 28885739. The reversal of 28885733 is 33758882.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 33758882 = 2 ⋅16879441.

It can be written as a sum of positive squares in 2 ways, for example, as 9375844 + 19509889 = 3062^2 + 4417^2 .

It is a cyclic number.

It is not a de Polignac number, because 28885733 - 2¹⁸ = 28623589 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 (28885739) 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, 1010 + ... + 7667.

It is an arithmetic number, because the mean of its divisors is an integer number (7224435).

Almost surely, 2^28885733 is an apocalyptic number.

It is an amenable number.

28885733 is a deficient number, since it is larger than the sum of its proper divisors (12007).

28885733 is an equidigital number, since it uses as much as digits as its factorization.

28885733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12006.

The product of its digits is 322560, while the sum is 44.

The square root of 28885733 is about 5374.5449109669. The cubic root of 28885733 is about 306.8276290840.

The spelling of 28885733 in words is "twenty-eight million, eight hundred eighty-five thousand, seven hundred thirty-three".