216664700 has 36 divisors (see below), whose sum is σ = 537330192. Its totient is φ = 74284800.

The previous prime is 216664663. The next prime is 216664709. The reversal of 216664700 is 7466612.

216664700 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 (216664709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154061 + ... + 155460.

Almost surely, 2^216664700 is an apocalyptic number.

216664700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216664700 is an abundant number, since it is smaller than the sum of its proper divisors (320665492).

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

216664700 is a wasteful number, since it uses less digits than its factorization.

216664700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309542 (or 309535 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 216664700 is about 14719.5346393831. The cubic root of 216664700 is about 600.6148327156.

It can be divided in two parts, 2166 and 64700, that added together give a palindrome (66866).

The spelling of 216664700 in words is "two hundred sixteen million, six hundred sixty-four thousand, seven hundred".