86639291 has 8 divisors (see below), whose sum is σ = 87865344. Its totient is φ = 85421160.

The previous prime is 86639279. The next prime is 86639299. The reversal of 86639291 is 19293668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 86639291 - 2¹⁰ = 86638267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86639299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22046 + ... + 25676.

It is an arithmetic number, because the mean of its divisors is an integer number (10983168).

Almost surely, 2^86639291 is an apocalyptic number.

86639291 is a deficient number, since it is larger than the sum of its proper divisors (1226053).

86639291 is a wasteful number, since it uses less digits than its factorization.

86639291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961.

The product of its digits is 139968, while the sum is 44.

The square root of 86639291 is about 9308.0229372300. The cubic root of 86639291 is about 442.4915312199.

The spelling of 86639291 in words is "eighty-six million, six hundred thirty-nine thousand, two hundred ninety-one".