222128640 has 240 divisors, whose sum is σ = 796663296. Its totient is φ = 57139200.

The previous prime is 222128597. The next prime is 222128653. The reversal of 222128640 is 46821222.

It is a happy number.

222128640 is a `hidden beast` number, since 2 + 2 + 2 + 12 + 8 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×222128640² = 98682265416499200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 714085 + ... + 714395.

Almost surely, 2^222128640 is an apocalyptic number.

222128640 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 222128640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398331648).

222128640 is an abundant number, since it is smaller than the sum of its proper divisors (574534656).

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

222128640 is a wasteful number, since it uses less digits than its factorization.

222128640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 222128640 is about 14903.9806763160. The cubic root of 222128640 is about 605.6218272478.

Adding to 222128640 its reverse (46821222), we get a palindrome (268949862).

The spelling of 222128640 in words is "two hundred twenty-two million, one hundred twenty-eight thousand, six hundred forty".