86818644 has 72 divisors (see below), whose sum is σ = 240589440. Its totient is φ = 26179200.

The previous prime is 86818639. The next prime is 86818651. The reversal of 86818644 is 44681868.

It is a self number, because there is not a number n which added to its sum of digits gives 86818644.

It is a congruent 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, 106912 + ... + 107720.

It is an arithmetic number, because the mean of its divisors is an integer number (3341520).

Almost surely, 2^86818644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86818644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120294720).

86818644 is an abundant number, since it is smaller than the sum of its proper divisors (153770796).

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

86818644 is a wasteful number, since it uses less digits than its factorization.

86818644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101 (or 1096 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 86818644 is about 9317.6522794103. The cubic root of 86818644 is about 442.7966563840.

It can be divided in two parts, 8681864 and 4, that added together give a palindrome (8681868).

The spelling of 86818644 in words is "eighty-six million, eight hundred eighteen thousand, six hundred forty-four".