1213328128 has 18 divisors (see below), whose sum is σ = 2421917204. Its totient is φ = 606663936.

The previous prime is 1213328107. The next prime is 1213328141. The reversal of 1213328128 is 8218233121.

It is a self number, because there is not a number n which added to its sum of digits gives 1213328128.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2369526 + ... + 2370037.

Almost surely, 2^1213328128 is an apocalyptic number.

It is an amenable number.

1213328128 is a deficient number, since it is larger than the sum of its proper divisors (1208589076).

1213328128 is an frugal number, since it uses more digits than its factorization.

1213328128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4739579 (or 4739565 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 1213328128 is about 34832.8598883296. The cubic root of 1213328128 is about 1066.5783287955.

The spelling of 1213328128 in words is "one billion, two hundred thirteen million, three hundred twenty-eight thousand, one hundred twenty-eight".