86691687 has 8 divisors (see below), whose sum is σ = 122388336. Its totient is φ = 54394752.

The previous prime is 86691637. The next prime is 86691691. The reversal of 86691687 is 78619668.

It is a happy number.

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

It is not a de Polignac number, because 86691687 - 2⁷ = 86691559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 1699837 = 86691687 / (8 + 6 + 6 + 9 + 1 + 6 + 8 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86691637) 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, 849868 + ... + 849969.

It is an arithmetic number, because the mean of its divisors is an integer number (15298542).

Almost surely, 2^86691687 is an apocalyptic number.

86691687 is a deficient number, since it is larger than the sum of its proper divisors (35696649).

86691687 is a wasteful number, since it uses less digits than its factorization.

86691687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699857.

The product of its digits is 870912, while the sum is 51.

The square root of 86691687 is about 9310.8370730026. The cubic root of 86691687 is about 442.5807136752.

It can be divided in two parts, 86691 and 687, that added together give a palindrome (87378).

The spelling of 86691687 in words is "eighty-six million, six hundred ninety-one thousand, six hundred eighty-seven".