28439983 has 16 divisors (see below), whose sum is σ = 34868736. Its totient is φ = 22825440.

The previous prime is 28439977. The next prime is 28439993. The reversal of 28439983 is 38993482.

It is not a de Polignac number, because 28439983 - 2⁵ = 28439951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28439993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1035 + ... + 7612.

It is an arithmetic number, because the mean of its divisors is an integer number (2179296).

Almost surely, 2^28439983 is an apocalyptic number.

28439983 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28439983 is a deficient number, since it is larger than the sum of its proper divisors (6428753).

28439983 is a wasteful number, since it uses less digits than its factorization.

28439983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8694.

The product of its digits is 373248, while the sum is 46.

The square root of 28439983 is about 5332.9150565146. The cubic root of 28439983 is about 305.2411708912.

It can be divided in two parts, 284399 and 83, that added together give a palindrome (284482).

The spelling of 28439983 in words is "twenty-eight million, four hundred thirty-nine thousand, nine hundred eighty-three".