1213767220 has 12 divisors (see below), whose sum is σ = 2548911204. Its totient is φ = 485506880.

The previous prime is 1213767179. The next prime is 1213767259. The reversal of 1213767220 is 227673121.

It can be written as a sum of positive squares in 2 ways, for example, as 921972496 + 291794724 = 30364^2 + 17082^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 30344161 + ... + 30344200.

It is an arithmetic number, because the mean of its divisors is an integer number (212409267).

Almost surely, 2^1213767220 is an apocalyptic number.

1213767220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213767220 is an abundant number, since it is smaller than the sum of its proper divisors (1335143984).

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

1213767220 is a wasteful number, since it uses less digits than its factorization.

1213767220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60688370 (or 60688368 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 1213767220 is about 34839.1621598453. The cubic root of 1213767220 is about 1066.7069748223.

The spelling of 1213767220 in words is "one billion, two hundred thirteen million, seven hundred sixty-seven thousand, two hundred twenty".