83685891 has 8 divisors (see below), whose sum is σ = 116432640. Its totient is φ = 53364872.

The previous prime is 83685863. The next prime is 83685913. The reversal of 83685891 is 19858638.

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 83685891 - 2⁶ = 83685827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83685891.

It is not an unprimeable number, because it can be changed into a prime (83685821) 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, 606351 + ... + 606488.

It is an arithmetic number, because the mean of its divisors is an integer number (14554080).

Almost surely, 2^83685891 is an apocalyptic number.

83685891 is a deficient number, since it is larger than the sum of its proper divisors (32746749).

83685891 is a wasteful number, since it uses less digits than its factorization.

83685891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212865.

The product of its digits is 414720, while the sum is 48.

The square root of 83685891 is about 9147.9992894621. Note that the first 3 decimals coincide. The cubic root of 83685891 is about 437.4053407179.

The spelling of 83685891 in words is "eighty-three million, six hundred eighty-five thousand, eight hundred ninety-one".