222216280 has 128 divisors (see below), whose sum is σ = 599296320. Its totient is φ = 73082880.

The previous prime is 222216259. The next prime is 222216283. The reversal of 222216280 is 82612222.

222216280 = 303² + 304² + ... + 885².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222216283) 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, 302794 + ... + 303526.

Almost surely, 2^222216280 is an apocalyptic number.

222216280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222216280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299648160).

222216280 is an abundant number, since it is smaller than the sum of its proper divisors (377080040).

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

222216280 is a wasteful number, since it uses less digits than its factorization.

222216280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 817 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 222216280 is about 14906.9205404738. The cubic root of 222216280 is about 605.7014653621.

The spelling of 222216280 in words is "two hundred twenty-two million, two hundred sixteen thousand, two hundred eighty".