1216313328 has 20 divisors (see below), whose sum is σ = 3142142888. Its totient is φ = 405437760.

The previous prime is 1216313317. The next prime is 1216313369. The reversal of 1216313328 is 8233136121.

It is a super-2 number, since 2×1216313328² = 2958836223740871168, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1216313295 and 1216313304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12669883 + ... + 12669978.

Almost surely, 2^1216313328 is an apocalyptic number.

It is an amenable number.

1216313328 is an abundant number, since it is smaller than the sum of its proper divisors (1925829560).

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

1216313328 is a wasteful number, since it uses less digits than its factorization.

1216313328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25339872 (or 25339866 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 1216313328 is about 34875.6839072727. The cubic root of 1216313328 is about 1067.4523275974.

Adding to 1216313328 its reverse (8233136121), we get a palindrome (9449449449).

The spelling of 1216313328 in words is "one billion, two hundred sixteen million, three hundred thirteen thousand, three hundred twenty-eight".