664460 has 12 divisors (see below), whose sum is σ = 1395408. Its totient is φ = 265776.

The previous prime is 664459. The next prime is 664471. The reversal of 664460 is 64466.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16592 + ... + 16631.

It is an arithmetic number, because the mean of its divisors is an integer number (116284).

2⁶⁶⁴⁴⁶⁰ is an apocalyptic number.

It is an amenable number.

664460 is an abundant number, since it is smaller than the sum of its proper divisors (730948).

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

664460 is a wasteful number, since it uses less digits than its factorization.

664460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33232 (or 33230 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 664460 is about 815.1441590296. The cubic root of 664460 is about 87.2615548882.

It can be divided in two parts, 6 and 64460, that multiplied together give a triangular number (386760 = T₈₇₉).

The spelling of 664460 in words is "six hundred sixty-four thousand, four hundred sixty".