667670 has 16 divisors (see below), whose sum is σ = 1211760. Its totient is φ = 264864.

The previous prime is 667657. The next prime is 667673. The reversal of 667670 is 76766.

It is a congruent number.

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

667670 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 (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1604 + ... + 1976.

It is an arithmetic number, because the mean of its divisors is an integer number (75735).

2⁶⁶⁷⁶⁷⁰ is an apocalyptic number.

667670 is a deficient number, since it is larger than the sum of its proper divisors (544090).

667670 is a wasteful number, since it uses less digits than its factorization.

667670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 667670 is about 817.1107636055. The cubic root of 667670 is about 87.4018491266.

It can be divided in two parts, 6 and 67670, that added together give a palindrome (67676).

The spelling of 667670 in words is "six hundred sixty-seven thousand, six hundred seventy".