28338505 has 16 divisors (see below), whose sum is σ = 37477440. Its totient is φ = 20438208.

The previous prime is 28338491. The next prime is 28338511. The reversal of 28338505 is 50583382.

It is a cyclic number.

It is not a de Polignac number, because 28338505 - 2¹¹ = 28336457 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2275 + ... + 7864.

It is an arithmetic number, because the mean of its divisors is an integer number (2342340).

Almost surely, 2^28338505 is an apocalyptic number.

It is an amenable number.

28338505 is a deficient number, since it is larger than the sum of its proper divisors (9138935).

28338505 is a wasteful number, since it uses less digits than its factorization.

28338505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10200.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 28338505 is about 5323.3922455517. The cubic root of 28338505 is about 304.8776899172.

The spelling of 28338505 in words is "twenty-eight million, three hundred thirty-eight thousand, five hundred five".