216810420 has 48 divisors (see below), whose sum is σ = 633467520. Its totient is φ = 55302016.

The previous prime is 216810329. The next prime is 216810421. The reversal of 216810420 is 24018612.

216810420 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 (216810421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77175 + ... + 79934.

It is an arithmetic number, because the mean of its divisors is an integer number (13197240).

Almost surely, 2^216810420 is an apocalyptic number.

216810420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216810420 is an abundant number, since it is smaller than the sum of its proper divisors (416657100).

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

216810420 is a wasteful number, since it uses less digits than its factorization.

216810420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157144 (or 157142 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 216810420 is about 14724.4836921367. The cubic root of 216810420 is about 600.7494523677.

The spelling of 216810420 in words is "two hundred sixteen million, eight hundred ten thousand, four hundred twenty".