28381606 has 32 divisors (see below), whose sum is σ = 47985696. Its totient is φ = 12480000.

The previous prime is 28381589. The next prime is 28381621. The reversal of 28381606 is 60618382.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 117646 + ... + 117886.

It is an arithmetic number, because the mean of its divisors is an integer number (1499553).

Almost surely, 2^28381606 is an apocalyptic number.

28381606 is a deficient number, since it is larger than the sum of its proper divisors (19604090).

28381606 is a wasteful number, since it uses less digits than its factorization.

28381606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28381606 is about 5327.4389719639. The cubic root of 28381606 is about 305.0321779183.

Adding to 28381606 its reverse (60618382), we get a palindrome (88999988).

It can be divided in two parts, 2838 and 1606, that added together give a palindrome (4444).

The spelling of 28381606 in words is "twenty-eight million, three hundred eighty-one thousand, six hundred six".