646613 has 8 divisors (see below), whose sum is σ = 730080. Its totient is φ = 567280.

The previous prime is 646609. The next prime is 646619. The reversal of 646613 is 316646.

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 646613 - 2² = 646609 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 (646619) 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 7 ways as a sum of consecutive naturals, for example, 695 + ... + 1332.

It is an arithmetic number, because the mean of its divisors is an integer number (91260).

2⁶⁴⁶⁶¹³ is an apocalyptic number.

It is an amenable number.

646613 is a deficient number, since it is larger than the sum of its proper divisors (83467).

646613 is a wasteful number, since it uses less digits than its factorization.

646613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2067.

The product of its digits is 2592, while the sum is 26.

The square root of 646613 is about 804.1225031051. The cubic root of 646613 is about 86.4731893699.

The spelling of 646613 in words is "six hundred forty-six thousand, six hundred thirteen".