28055386 has 8 divisors (see below), whose sum is σ = 42318720. Its totient is φ = 13949148.

The previous prime is 28055333. The next prime is 28055387. The reversal of 28055386 is 68355082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28055387) 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 3 ways as a sum of consecutive naturals, for example, 38826 + ... + 39541.

It is an arithmetic number, because the mean of its divisors is an integer number (5289840).

Almost surely, 2^28055386 is an apocalyptic number.

28055386 is a deficient number, since it is larger than the sum of its proper divisors (14263334).

28055386 is a wasteful number, since it uses less digits than its factorization.

28055386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78548.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 28055386 is about 5296.7335217094. The cubic root of 28055386 is about 303.8589849790.

It can be divided in two parts, 28055 and 386, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 28055386 in words is "twenty-eight million, fifty-five thousand, three hundred eighty-six".