11721128628 has 48 divisors (see below), whose sum is σ = 29850024960. Its totient is φ = 3550140000.

The previous prime is 11721128603. The next prime is 11721128687. The reversal of 11721128628 is 82682112711.

11721128628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267253 + ... + 308003.

It is an arithmetic number, because the mean of its divisors is an integer number (621875520).

Almost surely, 2^11721128628 is an apocalyptic number.

It is an amenable number.

11721128628 is an abundant number, since it is smaller than the sum of its proper divisors (18128896332).

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

11721128628 is a wasteful number, since it uses less digits than its factorization.

11721128628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42948 (or 42946 counting only the distinct ones).

The product of its digits is 21504, while the sum is 39.

The spelling of 11721128628 in words is "eleven billion, seven hundred twenty-one million, one hundred twenty-eight thousand, six hundred twenty-eight".