28158520155 has 16 divisors (see below), whose sum is σ = 47012486400. Its totient is φ = 14364926048.

The previous prime is 28158520151. The next prime is 28158520189. The reversal of 28158520155 is 55102585182.

It is a cyclic number.

It is not a de Polignac number, because 28158520155 - 2² = 28158520151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28158520151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40809105 + ... + 40809794.

It is an arithmetic number, because the mean of its divisors is an integer number (2938280400).

Almost surely, 2^28158520155 is an apocalyptic number.

28158520155 is a deficient number, since it is larger than the sum of its proper divisors (18853966245).

28158520155 is a wasteful number, since it uses less digits than its factorization.

28158520155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81618930.

The product of its (nonzero) digits is 160000, while the sum is 42.

The spelling of 28158520155 in words is "twenty-eight billion, one hundred fifty-eight million, five hundred twenty thousand, one hundred fifty-five".