85809723938 has 8 divisors (see below), whose sum is σ = 128716180140. Its totient is φ = 42904330560.

The previous prime is 85809723919. The next prime is 85809724001. The reversal of 85809723938 is 83932790858.

It can be written as a sum of positive squares in 2 ways, for example, as 81594208609 + 4215515329 = 285647^2 + 64927^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17483 + ... + 414638.

Almost surely, 2^85809723938 is an apocalyptic number.

85809723938 is a deficient number, since it is larger than the sum of its proper divisors (42906456202).

85809723938 is a wasteful number, since it uses less digits than its factorization.

85809723938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531412.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 85809723938 in words is "eighty-five billion, eight hundred nine million, seven hundred twenty-three thousand, nine hundred thirty-eight".