728964047666 has 16 divisors (see below), whose sum is σ = 1189057415256. Its totient is φ = 333770501376.

The previous prime is 728964047639. The next prime is 728964047699. The reversal of 728964047666 is 666740469827.

It can be written as a sum of positive squares in 4 ways, for example, as 718959847225 + 10004200441 = 847915^2 + 100021^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 289730081 + ... + 289732596.

Almost surely, 2^728964047666 is an apocalyptic number.

728964047666 is a deficient number, since it is larger than the sum of its proper divisors (460093367590).

728964047666 is a wasteful number, since it uses less digits than its factorization.

728964047666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579462733.

The product of its (nonzero) digits is 146313216, while the sum is 65.

The spelling of 728964047666 in words is "seven hundred twenty-eight billion, nine hundred sixty-four million, forty-seven thousand, six hundred sixty-six".