646307220 has 96 divisors (see below), whose sum is σ = 2011806720. Its totient is φ = 153953280.

The previous prime is 646307219. The next prime is 646307237. The reversal of 646307220 is 22703646.

646307220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10816 + ... + 37544.

It is an arithmetic number, because the mean of its divisors is an integer number (20956320).

Almost surely, 2^646307220 is an apocalyptic number.

646307220 is a gapful number since it is divisible by the number (60) 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 646307220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1005903360).

646307220 is an abundant number, since it is smaller than the sum of its proper divisors (1365499500).

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

646307220 is a wasteful number, since it uses less digits than its factorization.

646307220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26785 (or 26783 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 646307220 is about 25422.5730405087. The cubic root of 646307220 is about 864.5955631011.

The spelling of 646307220 in words is "six hundred forty-six million, three hundred seven thousand, two hundred twenty".