28385786 has 16 divisors (see below), whose sum is σ = 50023008. Its totient is φ = 11910000.

The previous prime is 28385783. The next prime is 28385803. The reversal of 28385786 is 68758382.

It is a self number, because there is not a number n which added to its sum of digits gives 28385786.

It is not an unprimeable number, because it can be changed into a prime (28385783) 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, 49340 + ... + 49911.

It is an arithmetic number, because the mean of its divisors is an integer number (3126438).

Almost surely, 2^28385786 is an apocalyptic number.

28385786 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28385786 is a deficient number, since it is larger than the sum of its proper divisors (21637222).

28385786 is a wasteful number, since it uses less digits than its factorization.

28385786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99277.

The product of its digits is 645120, while the sum is 47.

The square root of 28385786 is about 5327.8312660969. The cubic root of 28385786 is about 305.0471520758.

The spelling of 28385786 in words is "twenty-eight million, three hundred eighty-five thousand, seven hundred eighty-six".