728862667066 has 4 divisors (see below), whose sum is σ = 1093294000602. Its totient is φ = 364431333532.

The previous prime is 728862666991. The next prime is 728862667073. The reversal of 728862667066 is 660766268827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660766268827 = 7 ⋅94395181261.

It can be written as a sum of positive squares in only one way, i.e., 672916699225 + 55945967841 = 820315^2 + 236529^2 .

It is a super-2 number, since 2×728862667066² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 728862666989 and 728862667007.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182215666765 + ... + 182215666768.

Almost surely, 2^728862667066 is an apocalyptic number.

728862667066 is a deficient number, since it is larger than the sum of its proper divisors (364431333536).

728862667066 is a wasteful number, since it uses less digits than its factorization.

728862667066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364431333535.

The product of its (nonzero) digits is 97542144, while the sum is 64.

The spelling of 728862667066 in words is "seven hundred twenty-eight billion, eight hundred sixty-two million, six hundred sixty-seven thousand, sixty-six".