85816643 has 8 divisors (see below), whose sum is σ = 93706176. Its totient is φ = 77941800.

The previous prime is 85816583. The next prime is 85816693. The reversal of 85816643 is 34661858.

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 85816643 - 2¹⁰ = 85815619 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 85816643.

It is not an unprimeable number, because it can be changed into a prime (85816693) 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, 11180 + ... + 17222.

It is an arithmetic number, because the mean of its divisors is an integer number (11713272).

Almost surely, 2^85816643 is an apocalyptic number.

85816643 is a deficient number, since it is larger than the sum of its proper divisors (7889533).

85816643 is a wasteful number, since it uses less digits than its factorization.

85816643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7345.

The product of its digits is 138240, while the sum is 41.

The square root of 85816643 is about 9263.7272736194. The cubic root of 85816643 is about 441.0865758660.

The spelling of 85816643 in words is "eighty-five million, eight hundred sixteen thousand, six hundred forty-three".