28028733 has 16 divisors (see below), whose sum is σ = 40493376. Its totient is φ = 17176320.

The previous prime is 28028731. The next prime is 28028747. The reversal of 28028733 is 33782082.

It is a happy number.

It is not a de Polignac number, because 28028733 - 2¹ = 28028731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28028694 and 28028703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28028731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4198 + ... + 8583.

It is an arithmetic number, because the mean of its divisors is an integer number (2530836).

Almost surely, 2^28028733 is an apocalyptic number.

It is an amenable number.

28028733 is a deficient number, since it is larger than the sum of its proper divisors (12464643).

28028733 is a wasteful number, since it uses less digits than its factorization.

28028733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12844.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 28028733 is about 5294.2169392650. The cubic root of 28028733 is about 303.7627310961.

The spelling of 28028733 in words is "twenty-eight million, twenty-eight thousand, seven hundred thirty-three".