6428128550 has 24 divisors (see below), whose sum is σ = 12476161296. Its totient is φ = 2459457440.

The previous prime is 6428128549. The next prime is 6428128559. The reversal of 6428128550 is 558218246.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6428128498 and 6428128507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6428128559) 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 11 ways as a sum of consecutive naturals, for example, 2793689 + ... + 2795988.

It is an arithmetic number, because the mean of its divisors is an integer number (519840054).

Almost surely, 2^6428128550 is an apocalyptic number.

6428128550 is a deficient number, since it is larger than the sum of its proper divisors (6048032746).

6428128550 is a wasteful number, since it uses less digits than its factorization.

6428128550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5589712 (or 5589707 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 41.

The square root of 6428128550 is about 80175.6106930281. The cubic root of 6428128550 is about 1859.3515824747.

The spelling of 6428128550 in words is "six billion, four hundred twenty-eight million, one hundred twenty-eight thousand, five hundred fifty".