7928728730 has 16 divisors (see below), whose sum is σ = 15369535944. Its totient is φ = 2927530560.

The previous prime is 7928728727. The next prime is 7928728739. The reversal of 7928728730 is 378278297.

It can be written as a sum of positive squares in 4 ways, for example, as 2586434449 + 5342294281 = 50857^2 + 73091^2 .

It is not an unprimeable number, because it can be changed into a prime (7928728739) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 30494981 + ... + 30495240.

Almost surely, 2^7928728730 is an apocalyptic number.

7928728730 is a deficient number, since it is larger than the sum of its proper divisors (7440807214).

7928728730 is a wasteful number, since it uses less digits than its factorization.

7928728730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60990241.

The product of its (nonzero) digits is 2370816, while the sum is 53.

The square root of 7928728730 is about 89043.4092451541. The cubic root of 7928728730 is about 1994.0430022044.

The spelling of 7928728730 in words is "seven billion, nine hundred twenty-eight million, seven hundred twenty-eight thousand, seven hundred thirty".