1216732928 has 36 divisors (see below), whose sum is σ = 2469908280. Its totient is φ = 598047744.

The previous prime is 1216732921. The next prime is 1216732949. The reversal of 1216732928 is 8292376121.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216732921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25175 + ... + 55382.

Almost surely, 2^1216732928 is an apocalyptic number.

It is an amenable number.

1216732928 is an abundant number, since it is smaller than the sum of its proper divisors (1253175352).

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

1216732928 is an frugal number, since it uses more digits than its factorization.

1216732928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80632 (or 80618 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 1216732928 is about 34881.6990411878. The cubic root of 1216732928 is about 1067.5750622828.

The spelling of 1216732928 in words is "one billion, two hundred sixteen million, seven hundred thirty-two thousand, nine hundred twenty-eight".