222246640 has 160 divisors (see below), whose sum is σ = 652101120. Its totient is φ = 68428800.

The previous prime is 222246613. The next prime is 222246643. The reversal of 222246640 is 46642222.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 222246599 and 222246608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222246643) 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 31 ways as a sum of consecutive naturals, for example, 671275 + ... + 671605.

It is an arithmetic number, because the mean of its divisors is an integer number (4075632).

Almost surely, 2^222246640 is an apocalyptic number.

222246640 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 222246640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326050560).

222246640 is an abundant number, since it is smaller than the sum of its proper divisors (429854480).

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

222246640 is a wasteful number, since it uses less digits than its factorization.

222246640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 222246640 is about 14907.9388246665. The cubic root of 222246640 is about 605.7290484883.

Adding to 222246640 its reverse (46642222), we get a palindrome (268888862).

The spelling of 222246640 in words is "two hundred twenty-two million, two hundred forty-six thousand, six hundred forty".