85431729868 has 12 divisors (see below), whose sum is σ = 149507667232. Its totient is φ = 42715253520.

The previous prime is 85431729797. The next prime is 85431729881. The reversal of 85431729868 is 86892713458.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333421 + ... + 531067.

Almost surely, 2^85431729868 is an apocalyptic number.

It is an amenable number.

85431729868 is a deficient number, since it is larger than the sum of its proper divisors (64075937364).

85431729868 is a wasteful number, since it uses less digits than its factorization.

85431729868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305712 (or 305710 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 61.

The spelling of 85431729868 in words is "eighty-five billion, four hundred thirty-one million, seven hundred twenty-nine thousand, eight hundred sixty-eight".