1212666228 has 36 divisors (see below), whose sum is σ = 3178884800. Its totient is φ = 404221752.

The previous prime is 1212666227. The next prime is 1212666239. The reversal of 1212666228 is 8226662121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1212666192 and 1212666201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212666227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 622828 + ... + 624771.

Almost surely, 2^1212666228 is an apocalyptic number.

1212666228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1212666228 is an abundant number, since it is smaller than the sum of its proper divisors (1966218572).

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

1212666228 is a wasteful number, since it uses less digits than its factorization.

1212666228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247618 (or 1247604 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1212666228 is about 34823.3575061337. The cubic root of 1212666228 is about 1066.3843453784.

The spelling of 1212666228 in words is "one billion, two hundred twelve million, six hundred sixty-six thousand, two hundred twenty-eight".