216705900 has 36 divisors (see below), whose sum is σ = 627003272. Its totient is φ = 57788160.

The previous prime is 216705889. The next prime is 216705901. The reversal of 216705900 is 9507612.

216705900 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216705900² = 93922894189620000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (216705901) 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, 360877 + ... + 361476.

Almost surely, 2^216705900 is an apocalyptic number.

216705900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216705900 is an abundant number, since it is smaller than the sum of its proper divisors (410297372).

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

216705900 is a wasteful number, since it uses less digits than its factorization.

216705900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722370 (or 722363 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 216705900 is about 14720.9340736245. The cubic root of 216705900 is about 600.6529003885.

The spelling of 216705900 in words is "two hundred sixteen million, seven hundred five thousand, nine hundred".