28009337 has 4 divisors (see below), whose sum is σ = 28912896. Its totient is φ = 27105780.

The previous prime is 28009327. The next prime is 28009343. The reversal of 28009337 is 73390082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28009337 - 2¹⁴ = 27992953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28009307) 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, 451733 + ... + 451794.

It is an arithmetic number, because the mean of its divisors is an integer number (7228224).

Almost surely, 2^28009337 is an apocalyptic number.

It is an amenable number.

28009337 is a deficient number, since it is larger than the sum of its proper divisors (903559).

28009337 is an equidigital number, since it uses as much as digits as its factorization.

28009337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903558.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 28009337 is about 5292.3848121617. The cubic root of 28009337 is about 303.6926465689.

The spelling of 28009337 in words is "twenty-eight million, nine thousand, three hundred thirty-seven".