1216000000 has 182 divisors, whose sum is σ = 3199568420. Its totient is φ = 460800000.

The previous prime is 1215999989. The next prime is 1216000007. The reversal of 1216000000 is 6121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (1216000007) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 63999991 + ... + 64000009.

Almost surely, 2^1216000000 is an apocalyptic number.

1216000000 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 1216000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1599784210).

1216000000 is an abundant number, since it is smaller than the sum of its proper divisors (1983568420).

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

1216000000 is an frugal number, since it uses more digits than its factorization.

1216000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 26 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1216000000 is about 34871.1915483254. The cubic root of 1216000000 is about 1067.3606594888.

Adding to 1216000000 its reverse (6121), we get a palindrome (1216006121).

The spelling of 1216000000 in words is "one billion, two hundred sixteen million", and thus it is an aban number.