86128861 has 16 divisors (see below), whose sum is σ = 107065728. Its totient is φ = 67464000.

The previous prime is 86128853. The next prime is 86128873. The reversal of 86128861 is 16882168.

It is a cyclic number.

It is not a de Polignac number, because 86128861 - 2³ = 86128853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86128841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4506 + ... + 13876.

It is an arithmetic number, because the mean of its divisors is an integer number (6691608).

Almost surely, 2^86128861 is an apocalyptic number.

It is an amenable number.

86128861 is a deficient number, since it is larger than the sum of its proper divisors (20936867).

86128861 is a wasteful number, since it uses less digits than its factorization.

86128861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9492.

The product of its digits is 36864, while the sum is 40.

The square root of 86128861 is about 9280.5636143502. The cubic root of 86128861 is about 441.6208486627.

The spelling of 86128861 in words is "eighty-six million, one hundred twenty-eight thousand, eight hundred sixty-one".