670731809 has 8 divisors (see below), whose sum is σ = 738953280. Its totient is φ = 603718000.

The previous prime is 670731799. The next prime is 670731869. The reversal of 670731809 is 908137076.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 670731809 - 2¹² = 670727713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670731869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300749 + ... + 302970.

It is an arithmetic number, because the mean of its divisors is an integer number (92369160).

Almost surely, 2^670731809 is an apocalyptic number.

It is an amenable number.

670731809 is a deficient number, since it is larger than the sum of its proper divisors (68221471).

670731809 is a wasteful number, since it uses less digits than its factorization.

670731809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603831.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 670731809 is about 25898.4904772460. The cubic root of 670731809 is about 875.3524823146.

The spelling of 670731809 in words is "six hundred seventy million, seven hundred thirty-one thousand, eight hundred nine".