1226666220 has 144 divisors (see below), whose sum is σ = 3915555840. Its totient is φ = 286011648.

The previous prime is 1226666179. The next prime is 1226666261. The reversal of 1226666220 is 226666221.

It is an interprime number because it is at equal distance from previous prime (1226666179) and next prime (1226666261).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 189477 + ... + 195843.

It is an arithmetic number, because the mean of its divisors is an integer number (27191360).

Almost surely, 2^1226666220 is an apocalyptic number.

1226666220 is a gapful number since it is divisible by the number (10) 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 1226666220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1957777920).

1226666220 is an abundant number, since it is smaller than the sum of its proper divisors (2688889620).

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

1226666220 is a wasteful number, since it uses less digits than its factorization.

1226666220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6424 (or 6409 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 1226666220 is about 35023.7950542199. The cubic root of 1226666220 is about 1070.4723858236.

Subtracting from 1226666220 its reverse (226666221), we obtain a palindrome (999999999).

The spelling of 1226666220 in words is "one billion, two hundred twenty-six million, six hundred sixty-six thousand, two hundred twenty".