1216530300828 has 24 divisors (see below), whose sum is σ = 2874501978880. Its totient is φ = 400377060720.

The previous prime is 1216530300767. The next prime is 1216530300829. The reversal of 1216530300828 is 8280030356121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216530300829) 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, 641628958 + ... + 641630853.

Almost surely, 2^{1216530300828} is an apocalyptic number.

It is an amenable number.

1216530300828 is an abundant number, since it is smaller than the sum of its proper divisors (1657971678052).

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

1216530300828 is a wasteful number, since it uses less digits than its factorization.

1216530300828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283259897 (or 1283259895 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

Adding to 1216530300828 its reverse (8280030356121), we get a palindrome (9496560656949).

The spelling of 1216530300828 in words is "one trillion, two hundred sixteen billion, five hundred thirty million, three hundred thousand, eight hundred twenty-eight".