646507 has 4 divisors (see below), whose sum is σ = 674640. Its totient is φ = 618376.

The previous prime is 646453. The next prime is 646519. The reversal of 646507 is 705646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646507 - 2⁷ = 646379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14032 + ... + 14077.

It is an arithmetic number, because the mean of its divisors is an integer number (168660).

2⁶⁴⁶⁵⁰⁷ is an apocalyptic number.

646507 is a deficient number, since it is larger than the sum of its proper divisors (28133).

646507 is a wasteful number, since it uses less digits than its factorization.

646507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28132.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 646507 is about 804.0565900482. The cubic root of 646507 is about 86.4684638957.

The spelling of 646507 in words is "six hundred forty-six thousand, five hundred seven".