666360728 has 32 divisors (see below), whose sum is σ = 1371202560. Its totient is φ = 301070880.

The previous prime is 666360727. The next prime is 666360743. The reversal of 666360728 is 827063666.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666360727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7976 + ... + 37367.

It is an arithmetic number, because the mean of its divisors is an integer number (42850080).

Almost surely, 2^666360728 is an apocalyptic number.

It is an amenable number.

666360728 is an abundant number, since it is smaller than the sum of its proper divisors (704841832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666360728 is a wasteful number, since it uses less digits than its factorization.

666360728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45527 (or 45523 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 666360728 is about 25813.9638180579. The cubic root of 666360728 is about 873.4468132683.

The spelling of 666360728 in words is "six hundred sixty-six million, three hundred sixty thousand, seven hundred twenty-eight".