86691823 has 4 divisors (see below), whose sum is σ = 91791360. Its totient is φ = 81592288.

The previous prime is 86691811. The next prime is 86691863. The reversal of 86691823 is 32819668.

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 86691823 - 2⁵ = 86691791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86691823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86691863) 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, 2549743 + ... + 2549776.

It is an arithmetic number, because the mean of its divisors is an integer number (22947840).

Almost surely, 2^86691823 is an apocalyptic number.

86691823 is a deficient number, since it is larger than the sum of its proper divisors (5099537).

86691823 is a wasteful number, since it uses less digits than its factorization.

86691823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5099536.

The product of its digits is 124416, while the sum is 43.

The square root of 86691823 is about 9310.8443763173. The cubic root of 86691823 is about 442.5809451121.

The spelling of 86691823 in words is "eighty-six million, six hundred ninety-one thousand, eight hundred twenty-three".