728312066 has 16 divisors (see below), whose sum is σ = 1199966400. Its totient is φ = 329989968.

The previous prime is 728312063. The next prime is 728312077. The reversal of 728312066 is 660213827.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (728312063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415781 + ... + 417528.

It is an arithmetic number, because the mean of its divisors is an integer number (74997900).

Almost surely, 2^728312066 is an apocalyptic number.

728312066 is a deficient number, since it is larger than the sum of its proper divisors (471654334).

728312066 is a wasteful number, since it uses less digits than its factorization.

728312066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833353.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 728312066 is about 26987.2574745934. The cubic root of 728312066 is about 899.7168104908.

It can be divided in two parts, 72 and 8312066, that added together give a palindrome (8312138).

The spelling of 728312066 in words is "seven hundred twenty-eight million, three hundred twelve thousand, sixty-six".