667637 has 4 divisors (see below), whose sum is σ = 669900. Its totient is φ = 665376.

The previous prime is 667631. The next prime is 667643. The reversal of 667637 is 736766.

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

It is an interprime number because it is at equal distance from previous prime (667631) and next prime (667643).

It can be written as a sum of positive squares in 2 ways, for example, as 538756 + 128881 = 734^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 667637 - 2¹² = 663541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667597 and 667606.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 667637.

It is not an unprimeable number, because it can be changed into a prime (667631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608 + ... + 1305.

It is an arithmetic number, because the mean of its divisors is an integer number (167475).

2⁶⁶⁷⁶³⁷ is an apocalyptic number.

It is an amenable number.

667637 is a deficient number, since it is larger than the sum of its proper divisors (2263).

667637 is a wasteful number, since it uses less digits than its factorization.

667637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262.

The product of its digits is 31752, while the sum is 35.

The square root of 667637 is about 817.0905702552. The cubic root of 667637 is about 87.4004091395.

The spelling of 667637 in words is "six hundred sixty-seven thousand, six hundred thirty-seven".