646336480 has 96 divisors (see below), whose sum is σ = 1586148480. Its totient is φ = 248709120.

The previous prime is 646336463. The next prime is 646336529. The reversal of 646336480 is 84633646.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 458016 + ... + 459424.

It is an arithmetic number, because the mean of its divisors is an integer number (16522380).

Almost surely, 2^646336480 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 646336480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793074240).

646336480 is an abundant number, since it is smaller than the sum of its proper divisors (939812000).

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

646336480 is a wasteful number, since it uses less digits than its factorization.

646336480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532 (or 1524 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 646336480 is about 25423.1485068235. The cubic root of 646336480 is about 864.6086103969.

The spelling of 646336480 in words is "six hundred forty-six million, three hundred thirty-six thousand, four hundred eighty".