28393930 has 16 divisors (see below), whose sum is σ = 51873120. Its totient is φ = 11187792.

The previous prime is 28393913. The next prime is 28393949. The reversal of 28393930 is 3939382.

It is a self number, because there is not a number n which added to its sum of digits gives 28393930.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20520 + ... + 21859.

It is an arithmetic number, because the mean of its divisors is an integer number (3242070).

Almost surely, 2^28393930 is an apocalyptic number.

28393930 is a deficient number, since it is larger than the sum of its proper divisors (23479190).

28393930 is a wasteful number, since it uses less digits than its factorization.

28393930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42453.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 28393930 is about 5328.5954997541. The cubic root of 28393930 is about 305.0763223850.

The spelling of 28393930 in words is "twenty-eight million, three hundred ninety-three thousand, nine hundred thirty".