728669866 has 8 divisors (see below), whose sum is σ = 1101611520. Its totient is φ = 361466028.

The previous prime is 728669833. The next prime is 728669869. The reversal of 728669866 is 668966827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 728669866.

It is not an unprimeable number, because it can be changed into a prime (728669869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1434136 + ... + 1434643.

It is an arithmetic number, because the mean of its divisors is an integer number (137701440).

Almost surely, 2^728669866 is an apocalyptic number.

728669866 is a deficient number, since it is larger than the sum of its proper divisors (372941654).

728669866 is a wasteful number, since it uses less digits than its factorization.

728669866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2868908.

The product of its digits is 10450944, while the sum is 58.

The square root of 728669866 is about 26993.8857151022. The cubic root of 728669866 is about 899.8641218736.

The spelling of 728669866 in words is "seven hundred twenty-eight million, six hundred sixty-nine thousand, eight hundred sixty-six".