86779143889 has 9 divisors (see below), whose sum is σ = 87236070939. Its totient is φ = 86324602320.

The previous prime is 86779143877. The next prime is 86779143907. The reversal of 86779143889 is 98834197768.

The square root of 86779143889 is 294583.

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

It can be written as a sum of positive squares in only one way, i.e., 80334265489 + 6444878400 = 283433^2 + 80280^2 .

It is not a de Polignac number, because 86779143889 - 2¹⁹ = 86778619601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86779143839) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 65691349 + ... + 65692669.

It is an arithmetic number, because the mean of its divisors is an integer number (9692896771).

Almost surely, 2^86779143889 is an apocalyptic number.

86779143889 is the 294583-rd square number.

86779143889 is the 147292-nd centered octagonal number.

It is an amenable number.

86779143889 is a deficient number, since it is larger than the sum of its proper divisors (456927050).

86779143889 is an frugal number, since it uses more digits than its factorization.

86779143889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088 (or 1544 counting only the distinct ones).

The product of its digits is 146313216, while the sum is 70.

The spelling of 86779143889 in words is "eighty-six billion, seven hundred seventy-nine million, one hundred forty-three thousand, eight hundred eighty-nine".