28531733 has 2 divisors, whose sum is σ = 28531734. Its totient is φ = 28531732.

The previous prime is 28531717. The next prime is 28531759. The reversal of 28531733 is 33713582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25786084 + 2745649 = 5078^2 + 1657^2 .

It is a cyclic number.

It is not a de Polignac number, because 28531733 - 2⁴ = 28531717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28531733.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28531703) 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 as a sum of consecutive naturals, namely, 14265866 + 14265867.

It is an arithmetic number, because the mean of its divisors is an integer number (14265867).

Almost surely, 2^28531733 is an apocalyptic number.

It is an amenable number.

28531733 is a deficient number, since it is larger than the sum of its proper divisors (1).

28531733 is an equidigital number, since it uses as much as digits as its factorization.

28531733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 32.

The square root of 28531733 is about 5341.5103669281. The cubic root of 28531733 is about 305.5690638999.

The spelling of 28531733 in words is "twenty-eight million, five hundred thirty-one thousand, seven hundred thirty-three".