86691605 has 32 divisors (see below), whose sum is σ = 139684608. Its totient is φ = 49881600.

The previous prime is 86691601. The next prime is 86691637. The reversal of 86691605 is 50619668.

It is not a de Polignac number, because 86691605 - 2² = 86691601 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86691601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3656 + ... + 13665.

It is an arithmetic number, because the mean of its divisors is an integer number (4365144).

Almost surely, 2^86691605 is an apocalyptic number.

It is an amenable number.

86691605 is a deficient number, since it is larger than the sum of its proper divisors (52993003).

86691605 is a wasteful number, since it uses less digits than its factorization.

86691605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17357.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 86691605 is about 9310.8326695307. The cubic root of 86691605 is about 442.5805741323.

The spelling of 86691605 in words is "eighty-six million, six hundred ninety-one thousand, six hundred five".