86616891 has 16 divisors (see below), whose sum is σ = 129870720. Its totient is φ = 57047400.

The previous prime is 86616869. The next prime is 86616899. The reversal of 86616891 is 19861668.

86616891 = T₁₄₀₃ + T₁₄₀₄ + ... + T₁₄₈₅.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-86616891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86616899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17085 + ... + 21566.

It is an arithmetic number, because the mean of its divisors is an integer number (8116920).

Almost surely, 2^86616891 is an apocalyptic number.

86616891 is a deficient number, since it is larger than the sum of its proper divisors (43253829).

86616891 is a wasteful number, since it uses less digits than its factorization.

86616891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38743 (or 38737 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 86616891 is about 9306.8195964035. The cubic root of 86616891 is about 442.4533935401.

The spelling of 86616891 in words is "eighty-six million, six hundred sixteen thousand, eight hundred ninety-one".