1217326928 has 20 divisors (see below), whose sum is σ = 2364465108. Its totient is φ = 607142400.

The previous prime is 1217326927. The next prime is 1217326963. The reversal of 1217326928 is 8296237121.

It can be written as a sum of positive squares in 2 ways, for example, as 969201424 + 248125504 = 31132^2 + 15752^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217326921) 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, 88451 + ... + 101282.

Almost surely, 2^1217326928 is an apocalyptic number.

It is an amenable number.

1217326928 is a deficient number, since it is larger than the sum of its proper divisors (1147138180).

1217326928 is a wasteful number, since it uses less digits than its factorization.

1217326928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190142 (or 190136 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 1217326928 is about 34890.2124957702. The cubic root of 1217326928 is about 1067.7487614314.

The spelling of 1217326928 in words is "one billion, two hundred seventeen million, three hundred twenty-six thousand, nine hundred twenty-eight".