28128516155 has 16 divisors (see below), whose sum is σ = 34170867360. Its totient is φ = 22225206528.

The previous prime is 28128516137. The next prime is 28128516187. The reversal of 28128516155 is 55161582182.

It is a cyclic number.

It is not a de Polignac number, because 28128516155 - 2¹⁰ = 28128515131 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1822049 + ... + 1837421.

It is an arithmetic number, because the mean of its divisors is an integer number (2135679210).

Almost surely, 2^28128516155 is an apocalyptic number.

28128516155 is a deficient number, since it is larger than the sum of its proper divisors (6042351205).

28128516155 is a wasteful number, since it uses less digits than its factorization.

28128516155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19870.

The product of its digits is 192000, while the sum is 44.

The spelling of 28128516155 in words is "twenty-eight billion, one hundred twenty-eight million, five hundred sixteen thousand, one hundred fifty-five".