85721585800 has 24 divisors (see below), whose sum is σ = 199302687450. Its totient is φ = 34288634240.

The previous prime is 85721585777. The next prime is 85721585813. The reversal of 85721585800 is 858512758.

It can be written as a sum of positive squares in 3 ways, for example, as 71973085284 + 13748500516 = 268278^2 + 117254^2 .

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 5 ways as a sum of consecutive naturals, for example, 214303765 + ... + 214304164.

Almost surely, 2^85721585800 is an apocalyptic number.

It is an amenable number.

85721585800 is an abundant number, since it is smaller than the sum of its proper divisors (113581101650).

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

85721585800 is a wasteful number, since it uses less digits than its factorization.

85721585800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428607945 (or 428607936 counting only the distinct ones).

The product of its (nonzero) digits is 896000, while the sum is 49.

The spelling of 85721585800 in words is "eighty-five billion, seven hundred twenty-one million, five hundred eighty-five thousand, eight hundred".