646100 has 72 divisors (see below), whose sum is σ = 1749888. Its totient is φ = 201600.

The previous prime is 646099. The next prime is 646103. The reversal of 646100 is 1646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9065 + ... + 9135.

It is an arithmetic number, because the mean of its divisors is an integer number (24304).

2⁶⁴⁶¹⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (874944).

646100 is an abundant number, since it is smaller than the sum of its proper divisors (1103788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646100 is a wasteful number, since it uses less digits than its factorization.

646100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 646100 is about 803.8034585643. The cubic root of 646100 is about 86.4503150578.

Adding to 646100 its reverse (1646), we get a palindrome (647746).

The spelling of 646100 in words is "six hundred forty-six thousand, one hundred".