664896 has 28 divisors (see below), whose sum is σ = 1759712. Its totient is φ = 221568.

The previous prime is 664891. The next prime is 664933. The reversal of 664896 is 698466.

It is an Ulam number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1540 + ... + 1923.

2⁶⁶⁴⁸⁹⁶ is an apocalyptic number.

It is an amenable number.

664896 is an abundant number, since it is smaller than the sum of its proper divisors (1094816).

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

664896 is a wasteful number, since it uses less digits than its factorization.

664896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3478 (or 3468 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 664896 is about 815.4115525304. The cubic root of 664896 is about 87.2806369094.

It can be divided in two parts, 6 and 64896, that multiplied together give a square (389376 = 624²).

The spelling of 664896 in words is "six hundred sixty-four thousand, eight hundred ninety-six".