667672 has 8 divisors (see below), whose sum is σ = 1251900. Its totient is φ = 333832.

The previous prime is 667657. The next prime is 667673. The reversal of 667672 is 276766.

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41722 + ... + 41737.

2⁶⁶⁷⁶⁷² is an apocalyptic number.

It is an amenable number.

667672 is a deficient number, since it is larger than the sum of its proper divisors (584228).

667672 is a wasteful number, since it uses less digits than its factorization.

667672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83465 (or 83461 counting only the distinct ones).

The product of its digits is 21168, while the sum is 34.

The square root of 667672 is about 817.1119874289. Note that the first 3 decimals coincide. The cubic root of 667672 is about 87.4019363970.

The spelling of 667672 in words is "six hundred sixty-seven thousand, six hundred seventy-two".