216673820 has 24 divisors (see below), whose sum is σ = 496380528. Its totient is φ = 78790400.

The previous prime is 216673801. The next prime is 216673829. The reversal of 216673820 is 28376612.

It is a happy number.

216673820 is digitally balanced in base 2 and base 3, because in such bases 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 (216673829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492221 + ... + 492660.

It is an arithmetic number, because the mean of its divisors is an integer number (20682522).

Almost surely, 2^216673820 is an apocalyptic number.

216673820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216673820 is an abundant number, since it is smaller than the sum of its proper divisors (279706708).

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

216673820 is a wasteful number, since it uses less digits than its factorization.

216673820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984901 (or 984899 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 216673820 is about 14719.8444285257. The cubic root of 216673820 is about 600.6232597620.

The spelling of 216673820 in words is "two hundred sixteen million, six hundred seventy-three thousand, eight hundred twenty".