28338521 has 8 divisors (see below), whose sum is σ = 28902720. Its totient is φ = 27778608.

The previous prime is 28338511. The next prime is 28338523. The reversal of 28338521 is 12583382.

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

It is a cyclic number.

It is not a de Polignac number, because 28338521 - 2¹⁰ = 28337497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28338523) 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, 14420 + ... + 16266.

It is an arithmetic number, because the mean of its divisors is an integer number (3612840).

Almost surely, 2^28338521 is an apocalyptic number.

It is an amenable number.

28338521 is a deficient number, since it is larger than the sum of its proper divisors (564199).

28338521 is a wasteful number, since it uses less digits than its factorization.

28338521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143.

The product of its digits is 11520, while the sum is 32.

The square root of 28338521 is about 5323.3937483526. The cubic root of 28338521 is about 304.8777472955.

The spelling of 28338521 in words is "twenty-eight million, three hundred thirty-eight thousand, five hundred twenty-one".