670839665 has 8 divisors (see below), whose sum is σ = 805204608. Its totient is φ = 536540400.

The previous prime is 670839649. The next prime is 670839671. The reversal of 670839665 is 566938076.

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

It is not a de Polignac number, because 670839665 - 2⁴ = 670839649 is a prime.

It is a super-2 number, since 2×670839665² = 900051712274624450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9890 + ... + 37940.

It is an arithmetic number, because the mean of its divisors is an integer number (100650576).

Almost surely, 2^670839665 is an apocalyptic number.

It is an amenable number.

670839665 is a deficient number, since it is larger than the sum of its proper divisors (134364943).

670839665 is a wasteful number, since it uses less digits than its factorization.

670839665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32839.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 670839665 is about 25900.5726770664. The cubic root of 670839665 is about 875.3993997044.

The spelling of 670839665 in words is "six hundred seventy million, eight hundred thirty-nine thousand, six hundred sixty-five".