28556555 has 16 divisors (see below), whose sum is σ = 34997184. Its totient is φ = 22364160.

The previous prime is 28556533. The next prime is 28556557. The reversal of 28556555 is 55565582.

28556555 = T₂₆₁ + T₂₆₂ + ... + T₅₇₃.

It is not a de Polignac number, because 28556555 - 2⁶ = 28556491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28556557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91079 + ... + 91391.

It is an arithmetic number, because the mean of its divisors is an integer number (2187324).

Almost surely, 2^28556555 is an apocalyptic number.

28556555 is a deficient number, since it is larger than the sum of its proper divisors (6440629).

28556555 is a wasteful number, since it uses less digits than its factorization.

28556555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646.

The product of its digits is 300000, while the sum is 41.

The square root of 28556555 is about 5343.8333619229. The cubic root of 28556555 is about 305.6576510743.

The spelling of 28556555 in words is "twenty-eight million, five hundred fifty-six thousand, five hundred fifty-five".