667471987 has 8 divisors (see below), whose sum is σ = 821504096. Its totient is φ = 528109632.

The previous prime is 667471979. The next prime is 667471991. The reversal of 667471987 is 789174766.

667471987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667471987 - 2³ = 667471979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667471907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3667338 + ... + 3667519.

It is an arithmetic number, because the mean of its divisors is an integer number (102688012).

Almost surely, 2^667471987 is an apocalyptic number.

667471987 is a deficient number, since it is larger than the sum of its proper divisors (154032109).

667471987 is a wasteful number, since it uses less digits than its factorization.

667471987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7334877.

The product of its digits is 3556224, while the sum is 55.

The square root of 667471987 is about 25835.4792291531. The cubic root of 667471987 is about 873.9320792487.

The spelling of 667471987 in words is "six hundred sixty-seven million, four hundred seventy-one thousand, nine hundred eighty-seven".