646123452 has 192 divisors, whose sum is σ = 1807540224. Its totient is φ = 177914880.

The previous prime is 646123427. The next prime is 646123453. The reversal of 646123452 is 254321646.

646123452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646123453) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4115358 + ... + 4115514.

It is an arithmetic number, because the mean of its divisors is an integer number (9414272).

Almost surely, 2^646123452 is an apocalyptic number.

646123452 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646123452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903770112).

646123452 is an abundant number, since it is smaller than the sum of its proper divisors (1161416772).

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

646123452 is a wasteful number, since it uses less digits than its factorization.

646123452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 266 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 646123452 is about 25418.9585152500. The cubic root of 646123452 is about 864.5136103013.

The spelling of 646123452 in words is "six hundred forty-six million, one hundred twenty-three thousand, four hundred fifty-two".