6628791428 has 12 divisors (see below), whose sum is σ = 13257582912. Its totient is φ = 2840910600.

The previous prime is 6628791397. The next prime is 6628791437. The reversal of 6628791428 is 8241978266.

6628791428 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 6628791428.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118371248 + ... + 118371303.

It is an arithmetic number, because the mean of its divisors is an integer number (1104798576).

Almost surely, 2^6628791428 is an apocalyptic number.

It is an amenable number.

6628791428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6628791428 is a wasteful number, since it uses less digits than its factorization.

6628791428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236742562 (or 236742560 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 53.

The square root of 6628791428 is about 81417.3902062698. The cubic root of 6628791428 is about 1878.5010902187.

The spelling of 6628791428 in words is "six billion, six hundred twenty-eight million, seven hundred ninety-one thousand, four hundred twenty-eight".