667693 has 4 divisors (see below), whose sum is σ = 719068. Its totient is φ = 616320.

The previous prime is 667691. The next prime is 667697. The reversal of 667693 is 396766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56169 + 611524 = 237^2 + 782^2 .

It is a cyclic number.

It is not a de Polignac number, because 667693 - 2¹ = 667691 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25668 + ... + 25693.

It is an arithmetic number, because the mean of its divisors is an integer number (179767).

2⁶⁶⁷⁶⁹³ is an apocalyptic number.

It is an amenable number.

667693 is a deficient number, since it is larger than the sum of its proper divisors (51375).

667693 is a wasteful number, since it uses less digits than its factorization.

667693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51374.

The product of its digits is 40824, while the sum is 37.

The square root of 667693 is about 817.1248374637. The cubic root of 667693 is about 87.4028527259.

The spelling of 667693 in words is "six hundred sixty-seven thousand, six hundred ninety-three".