646858 has 8 divisors (see below), whose sum is σ = 973728. Its totient is φ = 322284.

The previous prime is 646843. The next prime is 646859. The reversal of 646858 is 858646.

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

It is not an unprimeable number, because it can be changed into a prime (646859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 685 + ... + 1327.

It is an arithmetic number, because the mean of its divisors is an integer number (121716).

2⁶⁴⁶⁸⁵⁸ is an apocalyptic number.

646858 is a deficient number, since it is larger than the sum of its proper divisors (326870).

646858 is a wasteful number, since it uses less digits than its factorization.

646858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148.

The product of its digits is 46080, while the sum is 37.

The square root of 646858 is about 804.2748286500. The cubic root of 646858 is about 86.4841094803.

It can be divided in two parts, 6 and 46858, that added together give a palindrome (46864).

The spelling of 646858 in words is "six hundred forty-six thousand, eight hundred fifty-eight".