670669 has 2 divisors, whose sum is σ = 670670. Its totient is φ = 670668.

The previous prime is 670639. The next prime is 670673. The reversal of 670669 is 966076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544644 + 126025 = 738^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 670669 - 2⁷ = 670541 is a prime.

It is a super-2 number, since 2×670669² = 899593815122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335334 + 335335.

It is an arithmetic number, because the mean of its divisors is an integer number (335335).

2⁶⁷⁰⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

670669 is a deficient number, since it is larger than the sum of its proper divisors (1).

670669 is an equidigital number, since it uses as much as digits as its factorization.

670669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 670669 is about 818.9438320178. The cubic root of 670669 is about 87.5325158065.

The spelling of 670669 in words is "six hundred seventy thousand, six hundred sixty-nine".