216371720 has 16 divisors (see below), whose sum is σ = 486836460. Its totient is φ = 86548672.

The previous prime is 216371711. The next prime is 216371737. The reversal of 216371720 is 27173612.

It can be written as a sum of positive squares in 2 ways, for example, as 204661636 + 11710084 = 14306^2 + 3422^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2704607 + ... + 2704686.

Almost surely, 2^216371720 is an apocalyptic number.

216371720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216371720 is an abundant number, since it is smaller than the sum of its proper divisors (270464740).

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

216371720 is a wasteful number, since it uses less digits than its factorization.

216371720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5409304 (or 5409300 counting only the distinct ones).

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

The square root of 216371720 is about 14709.5791918056. The cubic root of 216371720 is about 600.3439879347.

The spelling of 216371720 in words is "two hundred sixteen million, three hundred seventy-one thousand, seven hundred twenty".