85728715715 has 4 divisors (see below), whose sum is σ = 102874458864. Its totient is φ = 68582972568.

The previous prime is 85728715703. The next prime is 85728715739. The reversal of 85728715715 is 51751782758.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 85728715715 - 2¹⁰ = 85728714691 is a prime.

It is a super-2 number, since 2×85728715715² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

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, 8572871567 + ... + 8572871576.

It is an arithmetic number, because the mean of its divisors is an integer number (25718614716).

Almost surely, 2^85728715715 is an apocalyptic number.

85728715715 is a deficient number, since it is larger than the sum of its proper divisors (17145743149).

85728715715 is a wasteful number, since it uses less digits than its factorization.

85728715715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17145743148.

The product of its digits is 5488000, while the sum is 56.

The spelling of 85728715715 in words is "eighty-five billion, seven hundred twenty-eight million, seven hundred fifteen thousand, seven hundred fifteen".