215886664 has 96 divisors (see below), whose sum is σ = 499262400. Its totient is φ = 85691520.

The previous prime is 215886659. The next prime is 215886667. The reversal of 215886664 is 466688512.

215886664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215886667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1192654 + ... + 1192834.

It is an arithmetic number, because the mean of its divisors is an integer number (5200650).

Almost surely, 2^215886664 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 215886664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249631200).

215886664 is an abundant number, since it is smaller than the sum of its proper divisors (283375736).

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

215886664 is a wasteful number, since it uses less digits than its factorization.

215886664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 268 counting only the distinct ones).

The product of its digits is 552960, while the sum is 46.

The square root of 215886664 is about 14693.0821817616. The cubic root of 215886664 is about 599.8950408996.

The spelling of 215886664 in words is "two hundred fifteen million, eight hundred eighty-six thousand, six hundred sixty-four".