667320128 has 28 divisors (see below), whose sum is σ = 1393911360. Its totient is φ = 316098432.

The previous prime is 667320113. The next prime is 667320217. The reversal of 667320128 is 821023766.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273176 + ... + 275607.

Almost surely, 2^667320128 is an apocalyptic number.

It is an amenable number.

667320128 is an abundant number, since it is smaller than the sum of its proper divisors (726591232).

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

667320128 is a wasteful number, since it uses less digits than its factorization.

667320128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548814 (or 548804 counting only the distinct ones).

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

The square root of 667320128 is about 25832.5400996495. The cubic root of 667320128 is about 873.8657970574.

The spelling of 667320128 in words is "six hundred sixty-seven million, three hundred twenty thousand, one hundred twenty-eight".