28943438 has 16 divisors (see below), whose sum is σ = 43999200. Its totient is φ = 14278656.

The previous prime is 28943389. The next prime is 28943443. The reversal of 28943438 is 83434982.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28943395 and 28943404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64238 + ... + 64686.

It is an arithmetic number, because the mean of its divisors is an integer number (2749950).

Almost surely, 2^28943438 is an apocalyptic number.

28943438 is a deficient number, since it is larger than the sum of its proper divisors (15055762).

28943438 is a wasteful number, since it uses less digits than its factorization.

28943438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811.

The product of its digits is 165888, while the sum is 41.

The square root of 28943438 is about 5379.9105940527. The cubic root of 28943438 is about 307.0318095968.

The spelling of 28943438 in words is "twenty-eight million, nine hundred forty-three thousand, four hundred thirty-eight".