728745866 has 8 divisors (see below), whose sum is σ = 1113743844. Its totient is φ = 357497920.

The previous prime is 728745841. The next prime is 728745877. The reversal of 728745866 is 668547827.

It can be written as a sum of positive squares in 2 ways, for example, as 727434841 + 1311025 = 26971^2 + 1145^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3437375 + ... + 3437586.

Almost surely, 2^728745866 is an apocalyptic number.

728745866 is a deficient number, since it is larger than the sum of its proper divisors (384997978).

728745866 is a wasteful number, since it uses less digits than its factorization.

728745866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6875016.

The product of its digits is 4515840, while the sum is 53.

The square root of 728745866 is about 26995.2934045918. The cubic root of 728745866 is about 899.8954059520.

The spelling of 728745866 in words is "seven hundred twenty-eight million, seven hundred forty-five thousand, eight hundred sixty-six".