215683664 has 20 divisors (see below), whose sum is σ = 477585504. Its totient is φ = 92435808.

The previous prime is 215683661. The next prime is 215683669. The reversal of 215683664 is 466386512.

215683664 is digitally balanced in base 3, 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 (215683661) 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, 962762 + ... + 962985.

Almost surely, 2^215683664 is an apocalyptic number.

It is an amenable number.

215683664 is an abundant number, since it is smaller than the sum of its proper divisors (261901840).

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

215683664 is a wasteful number, since it uses less digits than its factorization.

215683664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925762 (or 1925756 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 215683664 is about 14686.1725442676. The cubic root of 215683664 is about 599.7069531922.

The spelling of 215683664 in words is "two hundred fifteen million, six hundred eighty-three thousand, six hundred sixty-four".