1216090876 has 144 divisors (see below), whose sum is σ = 2927812608. Its totient is φ = 429062400.

The previous prime is 1216090861. The next prime is 1216090879. The reversal of 1216090876 is 6780906121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216090879) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3174981 + ... + 3175363.

It is an arithmetic number, because the mean of its divisors is an integer number (20332032).

Almost surely, 2^1216090876 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 1216090876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1463906304).

1216090876 is an abundant number, since it is smaller than the sum of its proper divisors (1711721732).

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

1216090876 is a wasteful number, since it uses less digits than its factorization.

1216090876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 1216090876 is about 34872.4945479958. The cubic root of 1216090876 is about 1067.3872480444.

Adding to 1216090876 its reverse (6780906121), we get a palindrome (7996996997).

The spelling of 1216090876 in words is "one billion, two hundred sixteen million, ninety thousand, eight hundred seventy-six".