218197368 has 128 divisors (see below), whose sum is σ = 647040000. Its totient is φ = 67931136.

The previous prime is 218197361. The next prime is 218197373. The reversal of 218197368 is 863791812.

It is a super-2 number, since 2×218197368² = 95220182804254848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218197361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323880 + ... + 324552.

It is an arithmetic number, because the mean of its divisors is an integer number (5055000).

Almost surely, 2^218197368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218197368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323520000).

218197368 is an abundant number, since it is smaller than the sum of its proper divisors (428842632).

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

218197368 is a wasteful number, since it uses less digits than its factorization.

218197368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786 (or 776 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 218197368 is about 14771.5052719755. The cubic root of 218197368 is about 602.0277394016.

The spelling of 218197368 in words is "two hundred eighteen million, one hundred ninety-seven thousand, three hundred sixty-eight".