28724733 has 16 divisors (see below), whose sum is σ = 42895360. Its totient is φ = 18996768.

The previous prime is 28724719. The next prime is 28724737. The reversal of 28724733 is 33742782.

It is not a de Polignac number, because 28724733 - 2⁵ = 28724701 is a prime.

It is a super-2 number, since 2×28724733² = 1650220571842578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28724737) 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, 760 + ... + 7617.

It is an arithmetic number, because the mean of its divisors is an integer number (2680960).

Almost surely, 2^28724733 is an apocalyptic number.

It is an amenable number.

28724733 is a deficient number, since it is larger than the sum of its proper divisors (14170627).

28724733 is a wasteful number, since it uses less digits than its factorization.

28724733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8513 (or 8507 counting only the distinct ones).

The product of its digits is 56448, while the sum is 36.

The square root of 28724733 is about 5359.5459695762. The cubic root of 28724733 is about 306.2565130921.

The spelling of 28724733 in words is "twenty-eight million, seven hundred twenty-four thousand, seven hundred thirty-three".