86731218 has 48 divisors (see below), whose sum is σ = 216006336. Its totient is φ = 24636960.

The previous prime is 86731207. The next prime is 86731237. The reversal of 86731218 is 81213768.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20905 + ... + 24707.

It is an arithmetic number, because the mean of its divisors is an integer number (4500132).

Almost surely, 2^86731218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86731218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108003168).

86731218 is an abundant number, since it is smaller than the sum of its proper divisors (129275118).

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

86731218 is a wasteful number, since it uses less digits than its factorization.

86731218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999 (or 3996 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 86731218 is about 9312.9596799299. The cubic root of 86731218 is about 442.6479750247.

The spelling of 86731218 in words is "eighty-six million, seven hundred thirty-one thousand, two hundred eighteen".