216717320 has 16 divisors (see below), whose sum is σ = 487614060. Its totient is φ = 86686912.

The previous prime is 216717317. The next prime is 216717337. The reversal of 216717320 is 23717612.

It can be written as a sum of positive squares in 2 ways, for example, as 216148804 + 568516 = 14702^2 + 754^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2708927 + ... + 2709006.

Almost surely, 2^216717320 is an apocalyptic number.

216717320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216717320 is an abundant number, since it is smaller than the sum of its proper divisors (270896740).

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

216717320 is a wasteful number, since it uses less digits than its factorization.

216717320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5417944 (or 5417940 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 216717320 is about 14721.3219515097. The cubic root of 216717320 is about 600.6634513021.

The spelling of 216717320 in words is "two hundred sixteen million, seven hundred seventeen thousand, three hundred twenty".