858711728889 has 63 divisors (see below), whose sum is σ = 1497984744213. Its totient is φ = 490592336472.

The previous prime is 858711728837. The next prime is 858711728891. The reversal of 858711728889 is 988827117858.

The square root of 858711728889 is 926667.

It is a perfect power (a square), and thus also a powerful number.

858711728889 is a `hidden beast` number, since 8 + 587 + 1 + 17 + 28 + 8 + 8 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (63).

It is not a de Polignac number, because 858711728889 - 2¹⁷ = 858711597817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (858711728089) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 175137612 + ... + 175142514.

Almost surely, 2^858711728889 is an apocalyptic number.

858711728889 is the 926667-th square number.

858711728889 is the 463334-th centered octagonal number.

It is an amenable number.

858711728889 is a deficient number, since it is larger than the sum of its proper divisors (639273015324).

858711728889 is an frugal number, since it uses more digits than its factorization.

858711728889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9838 (or 4913 counting only the distinct ones).

The product of its digits is 144506880, while the sum is 72.

It can be divided in two parts, 858711 and 728889, that added together give a square (1587600 = 1260²).

The spelling of 858711728889 in words is "eight hundred fifty-eight billion, seven hundred eleven million, seven hundred twenty-eight thousand, eight hundred eighty-nine".