28666666655 has 32 divisors (see below), whose sum is σ = 38220553728. Its totient is φ = 20464732800.

The previous prime is 28666666643. The next prime is 28666666703. The reversal of 28666666655 is 55666666682.

It is not a de Polignac number, because 28666666655 - 2¹⁰ = 28666665631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1679072 + ... + 1696058.

It is an arithmetic number, because the mean of its divisors is an integer number (1194392304).

Almost surely, 2^28666666655 is an apocalyptic number.

28666666655 is a deficient number, since it is larger than the sum of its proper divisors (9553887073).

28666666655 is a wasteful number, since it uses less digits than its factorization.

28666666655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17567.

The product of its digits is 111974400, while the sum is 62.

The spelling of 28666666655 in words is "twenty-eight billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred fifty-five".