216968820 has 24 divisors (see below), whose sum is σ = 607512864. Its totient is φ = 57858336.

The previous prime is 216968789. The next prime is 216968827. The reversal of 216968820 is 28869612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216968827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1808014 + ... + 1808133.

It is an arithmetic number, because the mean of its divisors is an integer number (25313036).

Almost surely, 2^216968820 is an apocalyptic number.

216968820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216968820 is an abundant number, since it is smaller than the sum of its proper divisors (390544044).

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

216968820 is a wasteful number, since it uses less digits than its factorization.

216968820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3616159 (or 3616157 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 216968820 is about 14729.8615064772. The cubic root of 216968820 is about 600.8957177065.

The spelling of 216968820 in words is "two hundred sixteen million, nine hundred sixty-eight thousand, eight hundred twenty".