86668571 has 4 divisors (see below), whose sum is σ = 94547544. Its totient is φ = 78789600.

The previous prime is 86668537. The next prime is 86668579. The reversal of 86668571 is 17586668.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 86668571 - 2²² = 82474267 is a prime.

It is a super-2 number, since 2×86668571² = 15022882398364082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86668579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3939470 + ... + 3939491.

It is an arithmetic number, because the mean of its divisors is an integer number (23636886).

Almost surely, 2^86668571 is an apocalyptic number.

86668571 is a deficient number, since it is larger than the sum of its proper divisors (7878973).

86668571 is a wasteful number, since it uses less digits than its factorization.

86668571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878972.

The product of its digits is 483840, while the sum is 47.

The square root of 86668571 is about 9309.5956410577. The cubic root of 86668571 is about 442.5413727050.

The spelling of 86668571 in words is "eighty-six million, six hundred sixty-eight thousand, five hundred seventy-one".