646480 has 20 divisors (see below), whose sum is σ = 1503252. Its totient is φ = 258560.

The previous prime is 646453. The next prime is 646519. The reversal of 646480 is 84646.

646480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 226576 + 419904 = 476^2 + 648^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

646480 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3961 + ... + 4120.

2⁶⁴⁶⁴⁸⁰ is an apocalyptic number.

It is an amenable number.

646480 is an abundant number, since it is smaller than the sum of its proper divisors (856772).

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

646480 is a wasteful number, since it uses less digits than its factorization.

646480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8094 (or 8088 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 646480 is about 804.0398000099. The cubic root of 646480 is about 86.4672601547.

The spelling of 646480 in words is "six hundred forty-six thousand, four hundred eighty".