670005639 has 12 divisors (see below), whose sum is σ = 983652072. Its totient is φ = 439347600.

The previous prime is 670005601. The next prime is 670005643. The reversal of 670005639 is 936500076.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-670005639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670005659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 609657 + ... + 610754.

It is an arithmetic number, because the mean of its divisors is an integer number (81971006).

Almost surely, 2^670005639 is an apocalyptic number.

670005639 is a deficient number, since it is larger than the sum of its proper divisors (313646433).

670005639 is a wasteful number, since it uses less digits than its factorization.

670005639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220478 (or 1220475 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 670005639 is about 25884.4671376484. The cubic root of 670005639 is about 875.0364671604.

The spelling of 670005639 in words is "six hundred seventy million, five thousand, six hundred thirty-nine".