1216281352 has 96 divisors (see below), whose sum is σ = 2842156800. Its totient is φ = 483373440.

The previous prime is 1216281347. The next prime is 1216281389. The reversal of 1216281352 is 2531826121.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 236553 + ... + 241639.

It is an arithmetic number, because the mean of its divisors is an integer number (29605800).

Almost surely, 2^1216281352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216281352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1421078400).

1216281352 is an abundant number, since it is smaller than the sum of its proper divisors (1625875448).

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

1216281352 is a wasteful number, since it uses less digits than its factorization.

1216281352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5147 (or 5132 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 1216281352 is about 34875.2254759736. The cubic root of 1216281352 is about 1067.4429733315.

The spelling of 1216281352 in words is "one billion, two hundred sixteen million, two hundred eighty-one thousand, three hundred fifty-two".