30947790728 has 8 divisors (see below), whose sum is σ = 58027107630. Its totient is φ = 15473895360.

The previous prime is 30947790719. The next prime is 30947790763. The reversal of 30947790728 is 82709774903.

It can be written as a sum of positive squares in only one way, i.e., 21146394724 + 9801396004 = 145418^2 + 99002^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1934236913 + ... + 1934236928.

Almost surely, 2^30947790728 is an apocalyptic number.

It is an amenable number.

30947790728 is a deficient number, since it is larger than the sum of its proper divisors (27079316902).

30947790728 is a wasteful number, since it uses less digits than its factorization.

30947790728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868473847 (or 3868473843 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 56.

The spelling of 30947790728 in words is "thirty billion, nine hundred forty-seven million, seven hundred ninety thousand, seven hundred twenty-eight".