28983209 has 16 divisors (see below), whose sum is σ = 31006800. Its totient is φ = 27046656.

The previous prime is 28983203. The next prime is 28983217. The reversal of 28983209 is 90238982.

It can be written as a sum of positive squares in 8 ways, for example, as 5895184 + 23088025 = 2428^2 + 4805^2 .

It is a cyclic number.

It is not a de Polignac number, because 28983209 - 2⁸ = 28982953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28983203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167447 + ... + 167619.

It is an arithmetic number, because the mean of its divisors is an integer number (1937925).

Almost surely, 2^28983209 is an apocalyptic number.

28983209 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28983209 is a deficient number, since it is larger than the sum of its proper divisors (2023591).

28983209 is a wasteful number, since it uses less digits than its factorization.

28983209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 28983209 is about 5383.6055761915. The cubic root of 28983209 is about 307.1723754061.

It can be divided in two parts, 28983 and 209, that added together give a palindrome (29192).

The spelling of 28983209 in words is "twenty-eight million, nine hundred eighty-three thousand, two hundred nine".