1216548128 has 48 divisors (see below), whose sum is σ = 2495243520. Its totient is φ = 583200000.

The previous prime is 1216548127. The next prime is 1216548133. The reversal of 1216548128 is 8218456121.

It is a junction number, because it is equal to n+sod(n) for n = 1216548091 and 1216548100.

It is not an unprimeable number, because it can be changed into a prime (1216548121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102503 + ... + 113753.

It is an arithmetic number, because the mean of its divisors is an integer number (51984240).

Almost surely, 2^1216548128 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 1216548128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1247621760).

1216548128 is an abundant number, since it is smaller than the sum of its proper divisors (1278695392).

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

1216548128 is a wasteful number, since it uses less digits than its factorization.

1216548128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11401 (or 11393 counting only the distinct ones).

The product of its digits is 30720, while the sum is 38.

The square root of 1216548128 is about 34879.0499870624. The cubic root of 1216548128 is about 1067.5210110182.

The spelling of 1216548128 in words is "one billion, two hundred sixteen million, five hundred forty-eight thousand, one hundred twenty-eight".