42666728 has 16 divisors (see below), whose sum is σ = 86154180. Its totient is φ = 19692288.

The previous prime is 42666721. The next prime is 42666733. The reversal of 42666728 is 82766624.

It can be written as a sum of positive squares in 2 ways, for example, as 41964484 + 702244 = 6478^2 + 838^2 .

It is not an unprimeable number, because it can be changed into a prime (42666721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205025 + ... + 205232.

Almost surely, 2^42666728 is an apocalyptic number.

It is an amenable number.

42666728 is an abundant number, since it is smaller than the sum of its proper divisors (43487452).

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

42666728 is a wasteful number, since it uses less digits than its factorization.

42666728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410276 (or 410272 counting only the distinct ones).

The product of its digits is 193536, while the sum is 41.

The square root of 42666728 is about 6531.9773422755. The cubic root of 42666728 is about 349.4323533307.

The spelling of 42666728 in words is "forty-two million, six hundred sixty-six thousand, seven hundred twenty-eight".