1216199768 has 64 divisors (see below), whose sum is σ = 2683760640. Its totient is φ = 505782144.

The previous prime is 1216199741. The next prime is 1216199779. The reversal of 1216199768 is 8679916121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1257221 + ... + 1258187.

It is an arithmetic number, because the mean of its divisors is an integer number (41933760).

Almost surely, 2^1216199768 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 1216199768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1341880320).

1216199768 is an abundant number, since it is smaller than the sum of its proper divisors (1467560872).

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

1216199768 is a wasteful number, since it uses less digits than its factorization.

1216199768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624 (or 1620 counting only the distinct ones).

The product of its digits is 326592, while the sum is 50.

The square root of 1216199768 is about 34874.0558008385. The cubic root of 1216199768 is about 1067.4191059879.

The spelling of 1216199768 in words is "one billion, two hundred sixteen million, one hundred ninety-nine thousand, seven hundred sixty-eight".