1218728896 has 112 divisors (see below), whose sum is σ = 3031418880. Its totient is φ = 472273920.

The previous prime is 1218728881. The next prime is 1218728897. The reversal of 1218728896 is 6988278121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218728897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1098390 + ... + 1099498.

It is an arithmetic number, because the mean of its divisors is an integer number (27066240).

Almost surely, 2^1218728896 is an apocalyptic number.

1218728896 is a gapful number since it is divisible by the number (16) 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 1218728896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1515709440).

1218728896 is an abundant number, since it is smaller than the sum of its proper divisors (1812689984).

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

1218728896 is a wasteful number, since it uses less digits than its factorization.

1218728896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362 (or 1352 counting only the distinct ones).

The product of its digits is 774144, while the sum is 52.

The square root of 1218728896 is about 34910.2978503478. The cubic root of 1218728896 is about 1068.1585049059.

The spelling of 1218728896 in words is "one billion, two hundred eighteen million, seven hundred twenty-eight thousand, eight hundred ninety-six".