222212640 has 192 divisors, whose sum is σ = 762048000. Its totient is φ = 54104064.

The previous prime is 222212633. The next prime is 222212659. The reversal of 222212640 is 46212222.

It is an unprimeable number.

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, 929641 + ... + 929879.

It is an arithmetic number, because the mean of its divisors is an integer number (3969000).

Almost surely, 2^222212640 is an apocalyptic number.

222212640 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 222212640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (381024000).

222212640 is an abundant number, since it is smaller than the sum of its proper divisors (539835360).

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

222212640 is a wasteful number, since it uses less digits than its factorization.

222212640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 222212640 is about 14906.7984490299. The cubic root of 222212640 is about 605.6981581256.

Adding to 222212640 its reverse (46212222), we get a palindrome (268424862).

The spelling of 222212640 in words is "two hundred twenty-two million, two hundred twelve thousand, six hundred forty".