216778200 has 96 divisors (see below), whose sum is σ = 674361600. Its totient is φ = 57605760.

The previous prime is 216778171. The next prime is 216778259. The reversal of 216778200 is 2877612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262989 + ... + 263811.

It is an arithmetic number, because the mean of its divisors is an integer number (7024600).

Almost surely, 2^216778200 is an apocalyptic number.

216778200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216778200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337180800).

216778200 is an abundant number, since it is smaller than the sum of its proper divisors (457583400).

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

216778200 is a wasteful number, since it uses less digits than its factorization.

216778200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281 (or 1272 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 216778200 is about 14723.3895553979. The cubic root of 216778200 is about 600.7196919496.

The spelling of 216778200 in words is "two hundred sixteen million, seven hundred seventy-eight thousand, two hundred".