664480 has 24 divisors (see below), whose sum is σ = 1570212. Its totient is φ = 265728.

The previous prime is 664471. The next prime is 664507. The reversal of 664480 is 84466.

It can be written as a sum of positive squares in 2 ways, for example, as 559504 + 104976 = 748^2 + 324^2 .

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

664480 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1917 + ... + 2236.

2⁶⁶⁴⁴⁸⁰ is an apocalyptic number.

It is an amenable number.

664480 is an abundant number, since it is smaller than the sum of its proper divisors (905732).

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

664480 is a wasteful number, since it uses less digits than its factorization.

664480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4168 (or 4160 counting only the distinct ones).

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

The square root of 664480 is about 815.1564267059. The cubic root of 664480 is about 87.2624303929.

It can be divided in two parts, 6644 and 80, that added together give a square (6724 = 82²).

The spelling of 664480 in words is "six hundred sixty-four thousand, four hundred eighty".