646327420 has 48 divisors (see below), whose sum is σ = 1439974368. Its totient is φ = 242841600.

The previous prime is 646327417. The next prime is 646327441. The reversal of 646327420 is 24723646.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202759 + ... + 205921.

It is an arithmetic number, because the mean of its divisors is an integer number (29999466).

Almost surely, 2^646327420 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 646327420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (719987184).

646327420 is an abundant number, since it is smaller than the sum of its proper divisors (793646948).

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

646327420 is a wasteful number, since it uses less digits than its factorization.

646327420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3790 (or 3788 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 646327420 is about 25422.9703221319. The cubic root of 646327420 is about 864.6045705040.

The spelling of 646327420 in words is "six hundred forty-six million, three hundred twenty-seven thousand, four hundred twenty".