216485720 has 32 divisors (see below), whose sum is σ = 531375120. Its totient is φ = 78721920.

The previous prime is 216485719. The next prime is 216485813. The reversal of 216485720 is 27584612.

216485720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245567 + ... + 246446.

Almost surely, 2^216485720 is an apocalyptic number.

216485720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216485720 is an abundant number, since it is smaller than the sum of its proper divisors (314889400).

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

216485720 is a wasteful number, since it uses less digits than its factorization.

216485720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492035 (or 492031 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 216485720 is about 14713.4537074067. The cubic root of 216485720 is about 600.4494040500.

The spelling of 216485720 in words is "two hundred sixteen million, four hundred eighty-five thousand, seven hundred twenty".