216388064 has 12 divisors (see below), whose sum is σ = 426014064. Its totient is φ = 108194016.

The previous prime is 216388063. The next prime is 216388097. The reversal of 216388064 is 460883612.

It is a happy number.

216388064 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 (216388063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3381032 + ... + 3381095.

It is an arithmetic number, because the mean of its divisors is an integer number (35501172).

Almost surely, 2^216388064 is an apocalyptic number.

It is an amenable number.

216388064 is a deficient number, since it is larger than the sum of its proper divisors (209626000).

216388064 is an equidigital number, since it uses as much as digits as its factorization.

216388064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6762137 (or 6762129 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 216388064 is about 14710.1347376562. The cubic root of 216388064 is about 600.3591035500.

The spelling of 216388064 in words is "two hundred sixteen million, three hundred eighty-eight thousand, sixty-four".