670686818 has 8 divisors (see below), whose sum is σ = 1006748460. Its totient is φ = 335104000.

The previous prime is 670686811. The next prime is 670686847. The reversal of 670686818 is 818686076.

It can be written as a sum of positive squares in 2 ways, for example, as 607277449 + 63409369 = 24643^2 + 7963^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (670686811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116183 + ... + 121818.

Almost surely, 2^670686818 is an apocalyptic number.

670686818 is a deficient number, since it is larger than the sum of its proper divisors (336061642).

670686818 is a wasteful number, since it uses less digits than its factorization.

670686818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239412.

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 670686818 is about 25897.6218599315. The cubic root of 670686818 is about 875.3329097305.

The spelling of 670686818 in words is "six hundred seventy million, six hundred eighty-six thousand, eight hundred eighteen".