670986209 has 16 divisors (see below), whose sum is σ = 717741648. Its totient is φ = 625078272.

The previous prime is 670986191. The next prime is 670986223. The reversal of 670986209 is 902689076.

It can be written as a sum of positive squares in 8 ways, for example, as 228010000 + 442976209 = 15100^2 + 21047^2 .

It is a cyclic number.

It is not a de Polignac number, because 670986209 - 2¹² = 670982113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670986299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 990779 + ... + 991455.

It is an arithmetic number, because the mean of its divisors is an integer number (44858853).

Almost surely, 2^670986209 is an apocalyptic number.

It is an amenable number.

670986209 is a deficient number, since it is larger than the sum of its proper divisors (46755439).

670986209 is a wasteful number, since it uses less digits than its factorization.

670986209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 670986209 is about 25903.4014947844. The cubic root of 670986209 is about 875.4631383274.

The spelling of 670986209 in words is "six hundred seventy million, nine hundred eighty-six thousand, two hundred nine".