1212564256 has 48 divisors (see below), whose sum is σ = 2469374208. Its totient is φ = 585504000.

The previous prime is 1212564247. The next prime is 1212564257. The reversal of 1212564256 is 6524652121.

It is not an unprimeable number, because it can be changed into a prime (1212564257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 636906 + ... + 638806.

It is an arithmetic number, because the mean of its divisors is an integer number (51445296).

Almost surely, 2^1212564256 is an apocalyptic number.

1212564256 is a gapful number since it is divisible by the number (16) 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 1212564256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1234687104).

1212564256 is an abundant number, since it is smaller than the sum of its proper divisors (1256809952).

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

1212564256 is a wasteful number, since it uses less digits than its factorization.

1212564256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2585 (or 2577 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The square root of 1212564256 is about 34821.8933431254. The cubic root of 1212564256 is about 1066.3544541106.

The spelling of 1212564256 in words is "one billion, two hundred twelve million, five hundred sixty-four thousand, two hundred fifty-six".