1128776628721 has 27 divisors (see below), whose sum is σ = 1372846752921. Its totient is φ = 925316372904.

The previous prime is 1128776628719. The next prime is 1128776628743. The reversal of 1128776628721 is 1278266778211.

It is a happy number.

The square root of 1128776628721 is 1062439.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1128776628721 - 2¹ = 1128776628719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1128776628701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 171049380 + ... + 171055978.

Almost surely, 2^{1128776628721} is an apocalyptic number.

1128776628721 is the 1062439-th square number.

1128776628721 is the 531220-th centered octagonal number.

It is an amenable number.

1128776628721 is a deficient number, since it is larger than the sum of its proper divisors (244070124200).

1128776628721 is an frugal number, since it uses more digits than its factorization.

1128776628721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13258 (or 6629 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 58.

The spelling of 1128776628721 in words is "one trillion, one hundred twenty-eight billion, seven hundred seventy-six million, six hundred twenty-eight thousand, seven hundred twenty-one".