28439385 has 64 divisors (see below), whose sum is σ = 54286848. Its totient is φ = 12570624.

The previous prime is 28439377. The next prime is 28439387. The reversal of 28439385 is 58393482.

It is not a de Polignac number, because 28439385 - 2³ = 28439377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28439387) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 76059 + ... + 76431.

It is an arithmetic number, because the mean of its divisors is an integer number (848232).

Almost surely, 2^28439385 is an apocalyptic number.

It is an amenable number.

28439385 is a deficient number, since it is larger than the sum of its proper divisors (25847463).

28439385 is a wasteful number, since it uses less digits than its factorization.

28439385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434.

The product of its digits is 207360, while the sum is 42.

The square root of 28439385 is about 5332.8589893227. The cubic root of 28439385 is about 305.2390314678.

The spelling of 28439385 in words is "twenty-eight million, four hundred thirty-nine thousand, three hundred eighty-five".