667899648 has 144 divisors (see below), whose sum is σ = 2127313440. Its totient is φ = 205479936.

The previous prime is 667899643. The next prime is 667899677. The reversal of 667899648 is 846998766.

667899648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667899641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86140 + ... + 93572.

It is an arithmetic number, because the mean of its divisors is an integer number (14773010).

Almost surely, 2^667899648 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 667899648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1063656720).

667899648 is an abundant number, since it is smaller than the sum of its proper divisors (1459413792).

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

667899648 is a wasteful number, since it uses less digits than its factorization.

667899648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7471 (or 7451 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The square root of 667899648 is about 25843.7545259972. The cubic root of 667899648 is about 874.1186872665.

The spelling of 667899648 in words is "six hundred sixty-seven million, eight hundred ninety-nine thousand, six hundred forty-eight".