28556918 has 16 divisors (see below), whose sum is σ = 47113920. Its totient is φ = 12899136.

The previous prime is 28556917. The next prime is 28556929. The reversal of 28556918 is 81965582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28556917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10463 + ... + 12906.

It is an arithmetic number, because the mean of its divisors is an integer number (2944620).

Almost surely, 2^28556918 is an apocalyptic number.

28556918 is a deficient number, since it is larger than the sum of its proper divisors (18557002).

28556918 is a wasteful number, since it uses less digits than its factorization.

28556918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23431.

The product of its digits is 172800, while the sum is 44.

The square root of 28556918 is about 5343.8673261974. The cubic root of 28556918 is about 305.6589462031.

The spelling of 28556918 in words is "twenty-eight million, five hundred fifty-six thousand, nine hundred eighteen".