646478882280 has 1152 divisors, whose sum is σ = 2721208089600. Its totient is φ = 130233692160.

The previous prime is 646478882267. The next prime is 646478882303. The reversal of 646478882280 is 82288874646.

646478882280 is a `hidden beast` number, since 6 + 4 + 6 + 478 + 8 + 82 + 2 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 1761522657 + ... + 1761523023.

It is an arithmetic number, because the mean of its divisors is an integer number (2362159800).

Almost surely, 2^646478882280 is an apocalyptic number.

646478882280 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 646478882280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1360604044800).

646478882280 is an abundant number, since it is smaller than the sum of its proper divisors (2074729207320).

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

646478882280 is a wasteful number, since it uses less digits than its factorization.

646478882280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 66060288, while the sum is 63.

The spelling of 646478882280 in words is "six hundred forty-six billion, four hundred seventy-eight million, eight hundred eighty-two thousand, two hundred eighty".