646321480 has 128 divisors (see below), whose sum is σ = 1806336000. Its totient is φ = 203109120.

The previous prime is 646321477. The next prime is 646321483. The reversal of 646321480 is 84123646.

It is an interprime number because it is at equal distance from previous prime (646321477) and next prime (646321483).

It is not an unprimeable number, because it can be changed into a prime (646321483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162961 + ... + 166879.

It is an arithmetic number, because the mean of its divisors is an integer number (14112000).

Almost surely, 2^646321480 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 646321480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903168000).

646321480 is an abundant number, since it is smaller than the sum of its proper divisors (1160014520).

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

646321480 is a wasteful number, since it uses less digits than its factorization.

646321480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987 (or 3983 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 646321480 is about 25422.8534983782. The cubic root of 646321480 is about 864.6019218119.

The spelling of 646321480 in words is "six hundred forty-six million, three hundred twenty-one thousand, four hundred eighty".