86169978 has 72 divisors (see below), whose sum is σ = 200596500. Its totient is φ = 26725248.

The previous prime is 86169917. The next prime is 86170001. The reversal of 86169978 is 87996168.

It can be written as a sum of positive squares in 2 ways, for example, as 74080449 + 12089529 = 8607^2 + 3477^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 578248 + ... + 578396.

Almost surely, 2^86169978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86169978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100298250).

86169978 is an abundant number, since it is smaller than the sum of its proper divisors (114426522).

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

86169978 is a wasteful number, since it uses less digits than its factorization.

86169978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 262 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 86169978 is about 9282.7785710960. The cubic root of 86169978 is about 441.6911125111.

The spelling of 86169978 in words is "eighty-six million, one hundred sixty-nine thousand, nine hundred seventy-eight".