28316439 has 16 divisors (see below), whose sum is σ = 42067200. Its totient is φ = 18825048.

The previous prime is 28316437. The next prime is 28316443. The reversal of 28316439 is 93461382.

28316439 is a `hidden beast` number, since 2 + 8 + 3 + 1 + 643 + 9 = 666.

It is not a de Polignac number, because 28316439 - 2¹ = 28316437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28316437) by changing a digit.

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, 10062 + ... + 12564.

It is an arithmetic number, because the mean of its divisors is an integer number (2629200).

Almost surely, 2^28316439 is an apocalyptic number.

28316439 is a deficient number, since it is larger than the sum of its proper divisors (13750761).

28316439 is a wasteful number, since it uses less digits than its factorization.

28316439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931 (or 2925 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 28316439 is about 5321.3192913036. The cubic root of 28316439 is about 304.7985375651.

The spelling of 28316439 in words is "twenty-eight million, three hundred sixteen thousand, four hundred thirty-nine".