1218776328 has 256 divisors, whose sum is σ = 4261478400. Its totient is φ = 313528320.

The previous prime is 1218776309. The next prime is 1218776329. The reversal of 1218776328 is 8236778121.

1218776328 is a `hidden beast` number, since 1 + 2 + 1 + 8 + 7 + 7 + 632 + 8 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1218776329) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2111976 + ... + 2112552.

It is an arithmetic number, because the mean of its divisors is an integer number (16646400).

Almost surely, 2^1218776328 is an apocalyptic number.

1218776328 is a gapful number since it is divisible by the number (18) 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 1218776328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2130739200).

1218776328 is an abundant number, since it is smaller than the sum of its proper divisors (3042702072).

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

1218776328 is a wasteful number, since it uses less digits than its factorization.

1218776328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737 (or 727 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 1218776328 is about 34910.9771848340. The cubic root of 1218776328 is about 1068.1723620312.

The spelling of 1218776328 in words is "one billion, two hundred eighteen million, seven hundred seventy-six thousand, three hundred twenty-eight".