1216303880 has 64 divisors (see below), whose sum is σ = 3036139200. Its totient is φ = 434786560.

The previous prime is 1216303873. The next prime is 1216303889. The reversal of 1216303880 is 883036121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1216303889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2534 + ... + 49386.

It is an arithmetic number, because the mean of its divisors is an integer number (47439675).

Almost surely, 2^1216303880 is an apocalyptic number.

1216303880 is a gapful number since it is divisible by the number (10) 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 1216303880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1518069600).

1216303880 is an abundant number, since it is smaller than the sum of its proper divisors (1819835320).

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

1216303880 is a wasteful number, since it uses less digits than its factorization.

1216303880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46934 (or 46930 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1216303880 is about 34875.5484544688. The cubic root of 1216303880 is about 1067.4495636945.

The spelling of 1216303880 in words is "one billion, two hundred sixteen million, three hundred three thousand, eight hundred eighty".