86815885 has 16 divisors (see below), whose sum is σ = 112651056. Its totient is φ = 63848448.

The previous prime is 86815849. The next prime is 86815891. The reversal of 86815885 is 58851868.

It can be written as a sum of positive squares in 8 ways, for example, as 158404 + 86657481 = 398^2 + 9309^2 .

It is a cyclic number.

It is not a de Polignac number, because 86815885 - 2²³ = 78427277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 14107 + ... + 19303.

It is an arithmetic number, because the mean of its divisors is an integer number (7040691).

Almost surely, 2^86815885 is an apocalyptic number.

It is an amenable number.

86815885 is a deficient number, since it is larger than the sum of its proper divisors (25835171).

86815885 is a wasteful number, since it uses less digits than its factorization.

86815885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5472.

The product of its digits is 614400, while the sum is 49.

The square root of 86815885 is about 9317.5042259180. The cubic root of 86815885 is about 442.7919658058.

The spelling of 86815885 in words is "eighty-six million, eight hundred fifteen thousand, eight hundred eighty-five".