667247321 has 12 divisors (see below), whose sum is σ = 728061840. Its totient is φ = 611198640.

The previous prime is 667247311. The next prime is 667247327. The reversal of 667247321 is 123742766.

It is not a de Polignac number, because 667247321 - 2¹⁴ = 667230937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667247327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7070 + ... + 37208.

It is an arithmetic number, because the mean of its divisors is an integer number (60671820).

Almost surely, 2^667247321 is an apocalyptic number.

It is an amenable number.

667247321 is a deficient number, since it is larger than the sum of its proper divisors (60814519).

667247321 is a wasteful number, since it uses less digits than its factorization.

667247321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30296 (or 30283 counting only the distinct ones).

The product of its digits is 84672, while the sum is 38.

The square root of 667247321 is about 25831.1308501970. The cubic root of 667247321 is about 873.8340152791.

The spelling of 667247321 in words is "six hundred sixty-seven million, two hundred forty-seven thousand, three hundred twenty-one".