86646784 has 56 divisors (see below), whose sum is σ = 198168768. Its totient is φ = 37109760.

The previous prime is 86646761. The next prime is 86646787. The reversal of 86646784 is 48764668.

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (86646787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56589 + ... + 58099.

It is an arithmetic number, because the mean of its divisors is an integer number (3538728).

Almost surely, 2^86646784 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 86646784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99084384).

86646784 is an abundant number, since it is smaller than the sum of its proper divisors (111521984).

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

86646784 is an equidigital number, since it uses as much as digits as its factorization.

86646784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544 (or 1520 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 49.

The square root of 86646784 is about 9308.4254307590. The cubic root of 86646784 is about 442.5042871471.

The spelling of 86646784 in words is "eighty-six million, six hundred forty-six thousand, seven hundred eighty-four".