1216671728938 has 8 divisors (see below), whose sum is σ = 1869519973860. Its totient is φ = 593498404320.

The previous prime is 1216671728933. The next prime is 1216671728969. The reversal of 1216671728938 is 8398271766121.

It can be written as a sum of positive squares in 2 ways, for example, as 1149940956609 + 66730772329 = 1072353^2 + 258323^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1216671728933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7418729973 + ... + 7418730136.

Almost surely, 2^{1216671728938} is an apocalyptic number.

1216671728938 is a deficient number, since it is larger than the sum of its proper divisors (652848244922).

1216671728938 is a wasteful number, since it uses less digits than its factorization.

1216671728938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14837460152.

The product of its digits is 12192768, while the sum is 61.

The spelling of 1216671728938 in words is "one trillion, two hundred sixteen billion, six hundred seventy-one million, seven hundred twenty-eight thousand, nine hundred thirty-eight".