6643675028 has 18 divisors (see below), whose sum is σ = 12153910314. Its totient is φ = 3177408784.

The previous prime is 6643675019. The next prime is 6643675039. The reversal of 6643675028 is 8205763466.

It can be written as a sum of positive squares in only one way, i.e., 6022070404 + 621604624 = 77602^2 + 24932^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1567751 + ... + 1571982.

Almost surely, 2^6643675028 is an apocalyptic number.

It is an amenable number.

6643675028 is a deficient number, since it is larger than the sum of its proper divisors (5510235286).

6643675028 is a wasteful number, since it uses less digits than its factorization.

6643675028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139783 (or 3139758 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 47.

The square root of 6643675028 is about 81508.7420342137. The cubic root of 6643675028 is about 1879.9059697199.

The spelling of 6643675028 in words is "six billion, six hundred forty-three million, six hundred seventy-five thousand, twenty-eight".