28928786 has 16 divisors (see below), whose sum is σ = 44051904. Its totient is φ = 14246544.

The previous prime is 28928749. The next prime is 28928789. The reversal of 28928786 is 68782982.

It is not an unprimeable number, because it can be changed into a prime (28928789) by changing a digit.

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, 65081 + ... + 65523.

It is an arithmetic number, because the mean of its divisors is an integer number (2753244).

Almost surely, 2^28928786 is an apocalyptic number.

28928786 is a deficient number, since it is larger than the sum of its proper divisors (15123118).

28928786 is a wasteful number, since it uses less digits than its factorization.

28928786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865.

The product of its digits is 774144, while the sum is 50.

The square root of 28928786 is about 5378.5486890052. The cubic root of 28928786 is about 306.9799914103.

The spelling of 28928786 in words is "twenty-eight million, nine hundred twenty-eight thousand, seven hundred eighty-six".