30728688680 has 16 divisors (see below), whose sum is σ = 69139549620. Its totient is φ = 12291475456.

The previous prime is 30728688673. The next prime is 30728688701. The reversal of 30728688680 is 8688682703.

It can be written as a sum of positive squares in 2 ways, for example, as 30727986436 + 702244 = 175294^2 + 838^2 .

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, 384108569 + ... + 384108648.

Almost surely, 2^30728688680 is an apocalyptic number.

It is an amenable number.

30728688680 is an abundant number, since it is smaller than the sum of its proper divisors (38410860940).

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

30728688680 is a wasteful number, since it uses less digits than its factorization.

30728688680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768217228 (or 768217224 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 30728688680 in words is "thirty billion, seven hundred twenty-eight million, six hundred eighty-eight thousand, six hundred eighty".