85728793 has 4 divisors (see below), whose sum is σ = 85749300. Its totient is φ = 85708288.

The previous prime is 85728787. The next prime is 85728803. The reversal of 85728793 is 39782758.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65415744 + 20313049 = 8088^2 + 4507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85728793 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85728743) 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, 1480 + ... + 13177.

It is an arithmetic number, because the mean of its divisors is an integer number (21437325).

Almost surely, 2^85728793 is an apocalyptic number.

It is an amenable number.

85728793 is a deficient number, since it is larger than the sum of its proper divisors (20507).

85728793 is a wasteful number, since it uses less digits than its factorization.

85728793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20506.

The product of its digits is 846720, while the sum is 49.

The square root of 85728793 is about 9258.9844475515. The cubic root of 85728793 is about 440.9360118868.

The spelling of 85728793 in words is "eighty-five million, seven hundred twenty-eight thousand, seven hundred ninety-three".