666728536 has 32 divisors (see below), whose sum is σ = 1277373600. Its totient is φ = 326154240.

The previous prime is 666728527. The next prime is 666728581. The reversal of 666728536 is 635827666.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 666728536.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90645 + ... + 97723.

It is an arithmetic number, because the mean of its divisors is an integer number (39917925).

Almost surely, 2^666728536 is an apocalyptic number.

It is an amenable number.

666728536 is a deficient number, since it is larger than the sum of its proper divisors (610645064).

666728536 is a wasteful number, since it uses less digits than its factorization.

666728536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7339 (or 7335 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 49.

The square root of 666728536 is about 25821.0870414086. The cubic root of 666728536 is about 873.6074878208.

The spelling of 666728536 in words is "six hundred sixty-six million, seven hundred twenty-eight thousand, five hundred thirty-six".