646123000 has 128 divisors (see below), whose sum is σ = 1570907520. Its totient is φ = 248601600.

The previous prime is 646122991. The next prime is 646123003. The reversal of 646123000 is 321646.

It is a super-2 number, since 2×646123000² = 834949862258000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646123003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3868917 + ... + 3869083.

It is an arithmetic number, because the mean of its divisors is an integer number (12272715).

Almost surely, 2^646123000 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 646123000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (785453760).

646123000 is an abundant number, since it is smaller than the sum of its proper divisors (924784520).

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

646123000 is a wasteful number, since it uses less digits than its factorization.

646123000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 300 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 646123000 is about 25418.9496242469. The cubic root of 646123000 is about 864.5134087092.

Adding to 646123000 its reverse (321646), we get a palindrome (646444646).

The spelling of 646123000 in words is "six hundred forty-six million, one hundred twenty-three thousand".