666067328 has 64 divisors (see below), whose sum is σ = 1354560000. Its totient is φ = 326177280.

The previous prime is 666067321. The next prime is 666067379. The reversal of 666067328 is 823760666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666067321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2012123 + ... + 2012453.

It is an arithmetic number, because the mean of its divisors is an integer number (21165000).

Almost surely, 2^666067328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666067328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (677280000).

666067328 is an abundant number, since it is smaller than the sum of its proper divisors (688492672).

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

666067328 is a wasteful number, since it uses less digits than its factorization.

666067328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 611 counting only the distinct ones).

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

The square root of 666067328 is about 25808.2802216653. The cubic root of 666067328 is about 873.3186009726.

The spelling of 666067328 in words is "six hundred sixty-six million, sixty-seven thousand, three hundred twenty-eight".