85721875728 has 20 divisors (see below), whose sum is σ = 221448179088. Its totient is φ = 28573958560.

The previous prime is 85721875717. The next prime is 85721875741. The reversal of 85721875728 is 82757812758.

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, 892936158 + ... + 892936253.

Almost surely, 2^85721875728 is an apocalyptic number.

It is an amenable number.

85721875728 is an abundant number, since it is smaller than the sum of its proper divisors (135726303360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85721875728 is a wasteful number, since it uses less digits than its factorization.

85721875728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785872422 (or 1785872416 counting only the distinct ones).

The product of its digits is 17561600, while the sum is 60.

The spelling of 85721875728 in words is "eighty-five billion, seven hundred twenty-one million, eight hundred seventy-five thousand, seven hundred twenty-eight".