646041280 has 56 divisors (see below), whose sum is σ = 1541056608. Its totient is φ = 257968128.

The previous prime is 646041257. The next prime is 646041317. The reversal of 646041280 is 82140646.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231252 + ... + 234028.

It is an arithmetic number, because the mean of its divisors is an integer number (27518868).

Almost surely, 2^646041280 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 646041280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770528304).

646041280 is an abundant number, since it is smaller than the sum of its proper divisors (895015328).

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

646041280 is a wasteful number, since it uses less digits than its factorization.

646041280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3521 (or 3511 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 646041280 is about 25417.3421112437. The cubic root of 646041280 is about 864.4769600173.

The spelling of 646041280 in words is "six hundred forty-six million, forty-one thousand, two hundred eighty".