670917647 has 8 divisors (see below), whose sum is σ = 676057200. Its totient is φ = 665786880.

The previous prime is 670917571. The next prime is 670917661. The reversal of 670917647 is 746719076.

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 670917647 - 2⁸ = 670917391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670917547) 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, 313772 + ... + 315902.

It is an arithmetic number, because the mean of its divisors is an integer number (84507150).

Almost surely, 2^670917647 is an apocalyptic number.

670917647 is a deficient number, since it is larger than the sum of its proper divisors (5139553).

670917647 is a wasteful number, since it uses less digits than its factorization.

670917647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393.

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 670917647 is about 25902.0780440489. The cubic root of 670917647 is about 875.4333187636.

The spelling of 670917647 in words is "six hundred seventy million, nine hundred seventeen thousand, six hundred forty-seven".