28273733 has 4 divisors (see below), whose sum is σ = 28287180. Its totient is φ = 28260288.

The previous prime is 28273727. The next prime is 28273769. The reversal of 28273733 is 33737282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9628609 + 18645124 = 3103^2 + 4318^2 .

It is a cyclic number.

It is not a de Polignac number, because 28273733 - 2¹⁶ = 28208197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28273693 and 28273702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28273033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2810 + ... + 8027.

It is an arithmetic number, because the mean of its divisors is an integer number (7071795).

Almost surely, 2^28273733 is an apocalyptic number.

It is an amenable number.

28273733 is a deficient number, since it is larger than the sum of its proper divisors (13447).

28273733 is a wasteful number, since it uses less digits than its factorization.

28273733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13446.

The product of its digits is 42336, while the sum is 35.

The square root of 28273733 is about 5317.3050504932. The cubic root of 28273733 is about 304.6452311454.

The spelling of 28273733 in words is "twenty-eight million, two hundred seventy-three thousand, seven hundred thirty-three".