216411664 has 20 divisors (see below), whose sum is σ = 479197504. Its totient is φ = 92747808.

The previous prime is 216411661. The next prime is 216411703. The reversal of 216411664 is 466114612.

It is not an unprimeable number, because it can be changed into a prime (216411661) 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, 966012 + ... + 966235.

Almost surely, 2^216411664 is an apocalyptic number.

It is an amenable number.

216411664 is an abundant number, since it is smaller than the sum of its proper divisors (262785840).

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

216411664 is a wasteful number, since it uses less digits than its factorization.

216411664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932262 (or 1932256 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 216411664 is about 14710.9368838290. The cubic root of 216411664 is about 600.3809284750.

The spelling of 216411664 in words is "two hundred sixteen million, four hundred eleven thousand, six hundred sixty-four".