670707221 has 4 divisors (see below), whose sum is σ = 682075200. Its totient is φ = 659339244.

The previous prime is 670707199. The next prime is 670707223. The reversal of 670707221 is 122707076.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 670707221 - 2²⁶ = 603598357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670707223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5683901 + ... + 5684018.

It is an arithmetic number, because the mean of its divisors is an integer number (170518800).

Almost surely, 2^670707221 is an apocalyptic number.

It is an amenable number.

670707221 is a deficient number, since it is larger than the sum of its proper divisors (11367979).

670707221 is a wasteful number, since it uses less digits than its factorization.

670707221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11367978.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 670707221 is about 25898.0157734140. The cubic root of 670707221 is about 875.3417858238.

The spelling of 670707221 in words is "six hundred seventy million, seven hundred seven thousand, two hundred twenty-one".