667572 has 12 divisors (see below), whose sum is σ = 1557696. Its totient is φ = 222520.

The previous prime is 667561. The next prime is 667577. The reversal of 667572 is 275766.

667572 is nontrivially palindromic in base 11.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667577) by changing a digit.

667572 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27804 + ... + 27827.

It is an arithmetic number, because the mean of its divisors is an integer number (129808).

2⁶⁶⁷⁵⁷² is an apocalyptic number.

It is an amenable number.

667572 is an abundant number, since it is smaller than the sum of its proper divisors (890124).

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

667572 is a wasteful number, since it uses less digits than its factorization.

667572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55638 (or 55636 counting only the distinct ones).

The product of its digits is 17640, while the sum is 33.

The square root of 667572 is about 817.0507940147. The cubic root of 667572 is about 87.3975726625.

The spelling of 667572 in words is "six hundred sixty-seven thousand, five hundred seventy-two".