667824128 has 52 divisors (see below), whose sum is σ = 1364292960. Its totient is φ = 326713344.

The previous prime is 667824097. The next prime is 667824133. The reversal of 667824128 is 821428766.

It is an unprimeable number.

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, 190778 + ... + 194246.

Almost surely, 2^667824128 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 667824128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (682146480).

667824128 is an abundant number, since it is smaller than the sum of its proper divisors (696468832).

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

667824128 is an equidigital number, since it uses as much as digits as its factorization.

667824128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3540 (or 3518 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 667824128 is about 25842.2933966782. The cubic root of 667824128 is about 874.0857402353.

The spelling of 667824128 in words is "six hundred sixty-seven million, eight hundred twenty-four thousand, one hundred twenty-eight".