670509 has 24 divisors (see below), whose sum is σ = 1148160. Its totient is φ = 368928.

The previous prime is 670507. The next prime is 670511. The reversal of 670509 is 905076.

It is an interprime number because it is at equal distance from previous prime (670507) and next prime (670511).

It is not a de Polignac number, because 670509 - 2¹ = 670507 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1644 + ... + 2010.

It is an arithmetic number, because the mean of its divisors is an integer number (47840).

2⁶⁷⁰⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

670509 is a deficient number, since it is larger than the sum of its proper divisors (477651).

670509 is a wasteful number, since it uses less digits than its factorization.

670509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 670509 is about 818.8461393937. The cubic root of 670509 is about 87.5255544408.

The spelling of 670509 in words is "six hundred seventy thousand, five hundred nine".