646707 has 8 divisors (see below), whose sum is σ = 874384. Its totient is φ = 425088.

The previous prime is 646687. The next prime is 646721. The reversal of 646707 is 707646.

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

It is not a de Polignac number, because 646707 - 2⁶ = 646643 is a prime.

It is a Duffinian number.

646707 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646707.

It is not an unprimeable number, because it can be changed into a prime (646757) 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, 1258 + ... + 1695.

It is an arithmetic number, because the mean of its divisors is an integer number (109298).

2⁶⁴⁶⁷⁰⁷ is an apocalyptic number.

646707 is a deficient number, since it is larger than the sum of its proper divisors (227677).

646707 is a wasteful number, since it uses less digits than its factorization.

646707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3029.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 646707 is about 804.1809497868. The cubic root of 646707 is about 86.4773794526.

The spelling of 646707 in words is "six hundred forty-six thousand, seven hundred seven".