667072 has 28 divisors (see below), whose sum is σ = 1513840. Its totient is φ = 285696.

The previous prime is 667021. The next prime is 667081. The reversal of 667072 is 270766.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 667072.

It is a congruent number.

It is an unprimeable number.

667072 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297 + ... + 1192.

2⁶⁶⁷⁰⁷² is an apocalyptic number.

It is an amenable number.

667072 is an abundant number, since it is smaller than the sum of its proper divisors (846768).

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

667072 is a wasteful number, since it uses less digits than its factorization.

667072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 667072 is about 816.7447581711. The cubic root of 667072 is about 87.3757474508.

The spelling of 667072 in words is "six hundred sixty-seven thousand, seventy-two".