667064080 has 20 divisors (see below), whose sum is σ = 1550924172. Its totient is φ = 266825600.

The previous prime is 667064077. The next prime is 667064081. The reversal of 667064080 is 80460766.

It can be written as a sum of positive squares in 2 ways, for example, as 134931456 + 532132624 = 11616^2 + 23068^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (667064081) 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 3 ways as a sum of consecutive naturals, for example, 4169071 + ... + 4169230.

Almost surely, 2^667064080 is an apocalyptic number.

It is an amenable number.

667064080 is an abundant number, since it is smaller than the sum of its proper divisors (883860092).

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

667064080 is a wasteful number, since it uses less digits than its factorization.

667064080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8338314 (or 8338308 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 667064080 is about 25827.5837042492. The cubic root of 667064080 is about 873.7540165172.

The spelling of 667064080 in words is "six hundred sixty-seven million, sixty-four thousand, eighty".