862886792889 has 75 divisors (see below), whose sum is σ = 1419559490415. Its totient is φ = 522348607440.

The previous prime is 862886792879. The next prime is 862886792903. The reversal of 862886792889 is 988297688268.

The square root of 862886792889 is 928917.

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

862886792889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 49838330025 + 813048462864 = 223245^2 + 901692^2 .

It is not a de Polignac number, because 862886792889 - 2⁹ = 862886792377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (862886792809) by changing a digit.

It is a polite number, since it can be written in 74 ways as a sum of consecutive naturals, for example, 1011590187 + ... + 1011591039.

Almost surely, 2^862886792889 is an apocalyptic number.

862886792889 is the 928917-th square number.

862886792889 is the 464459-th centered octagonal number.

It is an amenable number.

862886792889 is a deficient number, since it is larger than the sum of its proper divisors (556672697526).

862886792889 is an frugal number, since it uses more digits than its factorization.

862886792889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762 (or 867 counting only the distinct ones).

The product of its digits is 2675441664, while the sum is 81.

Multiplying 862886792889 by its sum of digits (81), we get a square (69893830224009 = 8360253²).

862886792889 divided by its sum of digits (81) gives a square (10652923369 = 103213²).

The spelling of 862886792889 in words is "eight hundred sixty-two billion, eight hundred eighty-six million, seven hundred ninety-two thousand, eight hundred eighty-nine".