646617 has 8 divisors (see below), whose sum is σ = 875296. Its totient is φ = 424512.

The previous prime is 646609. The next prime is 646619. The reversal of 646617 is 716646.

646617 is nontrivially palindromic in base 16.

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

It is not a de Polignac number, because 646617 - 2³ = 646609 is a prime.

It is a super-2 number, since 2×646617² = 836227089378, which contains 22 as substring.

It is a Duffinian 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, 1408 + ... + 1809.

It is an arithmetic number, because the mean of its divisors is an integer number (109412).

2⁶⁴⁶⁶¹⁷ is an apocalyptic number.

646617 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

646617 is a deficient number, since it is larger than the sum of its proper divisors (228679).

646617 is a wasteful number, since it uses less digits than its factorization.

646617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3287.

The product of its digits is 6048, while the sum is 30.

The square root of 646617 is about 804.1249902845. The cubic root of 646617 is about 86.4733676795.

The spelling of 646617 in words is "six hundred forty-six thousand, six hundred seventeen".