28238337 has 6 divisors (see below), whose sum is σ = 40788722. Its totient is φ = 18825552.

The previous prime is 28238317. The next prime is 28238387. The reversal of 28238337 is 73383282.

It can be written as a sum of positive squares in only one way, i.e., 23415921 + 4822416 = 4839^2 + 2196^2 .

It is not a de Polignac number, because 28238337 - 2¹¹ = 28236289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28238317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1568788 + ... + 1568805.

Almost surely, 2^28238337 is an apocalyptic number.

It is an amenable number.

28238337 is a deficient number, since it is larger than the sum of its proper divisors (12550385).

28238337 is a wasteful number, since it uses less digits than its factorization.

28238337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3137599 (or 3137596 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 28238337 is about 5313.9756303544. The cubic root of 28238337 is about 304.5180491942.

The spelling of 28238337 in words is "twenty-eight million, two hundred thirty-eight thousand, three hundred thirty-seven".