670906605 has 8 divisors (see below), whose sum is σ = 1073450592. Its totient is φ = 357816848.

The previous prime is 670906603. The next prime is 670906633. The reversal of 670906605 is 506609076.

It is a happy number.

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 670906605 - 2¹ = 670906603 is a prime.

It is a super-3 number, since 3×670906605³ (a number of 27 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670906603) 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, 22363539 + ... + 22363568.

It is an arithmetic number, because the mean of its divisors is an integer number (134181324).

Almost surely, 2^670906605 is an apocalyptic number.

It is an amenable number.

670906605 is a deficient number, since it is larger than the sum of its proper divisors (402543987).

670906605 is a wasteful number, since it uses less digits than its factorization.

670906605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44727115.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 670906605 is about 25901.8648942504. The cubic root of 670906605 is about 875.4285160938.

The spelling of 670906605 in words is "six hundred seventy million, nine hundred six thousand, six hundred five".