85728643 has 16 divisors (see below), whose sum is σ = 115105536. Its totient is φ = 61662240.

The previous prime is 85728641. The next prime is 85728653. The reversal of 85728643 is 34682758.

It is a cyclic number.

It is not a de Polignac number, because 85728643 - 2¹ = 85728641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85728643.

It is not an unprimeable number, because it can be changed into a prime (85728641) 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, 41821 + ... + 43822.

It is an arithmetic number, because the mean of its divisors is an integer number (7194096).

Almost surely, 2^85728643 is an apocalyptic number.

85728643 is a deficient number, since it is larger than the sum of its proper divisors (29376893).

85728643 is a wasteful number, since it uses less digits than its factorization.

85728643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85674.

The product of its digits is 322560, while the sum is 43.

The square root of 85728643 is about 9258.9763473075. The cubic root of 85728643 is about 440.9357547175.

The spelling of 85728643 in words is "eighty-five million, seven hundred twenty-eight thousand, six hundred forty-three".