28664733 has 8 divisors (see below), whose sum is σ = 38257408. Its totient is φ = 19090944.

The previous prime is 28664729. The next prime is 28664767. The reversal of 28664733 is 33746682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28664733 - 2² = 28664729 is a prime.

It is a super-2 number, since 2×28664733² = 1643333835922578, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28664691 and 28664700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28664723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 685 + ... + 7602.

It is an arithmetic number, because the mean of its divisors is an integer number (4782176).

Almost surely, 2^28664733 is an apocalyptic number.

It is an amenable number.

28664733 is a deficient number, since it is larger than the sum of its proper divisors (9592675).

28664733 is a wasteful number, since it uses less digits than its factorization.

28664733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9443.

The product of its digits is 145152, while the sum is 39.

The square root of 28664733 is about 5353.9455544486. The cubic root of 28664733 is about 306.0431290399.

The spelling of 28664733 in words is "twenty-eight million, six hundred sixty-four thousand, seven hundred thirty-three".