664496 has 40 divisors (see below), whose sum is σ = 1562400. Its totient is φ = 267264.

The previous prime is 664471. The next prime is 664507. The reversal of 664496 is 694466.

It is a plaindrome in base 9.

It is an unprimeable number.

664496 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 7 ways as a sum of consecutive naturals, for example, 1730 + ... + 2078.

It is an arithmetic number, because the mean of its divisors is an integer number (39060).

2⁶⁶⁴⁴⁹⁶ 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 664496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (781200).

664496 is an abundant number, since it is smaller than the sum of its proper divisors (897904).

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

664496 is a wasteful number, since it uses less digits than its factorization.

664496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 375 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 664496 is about 815.1662407141. The cubic root of 664496 is about 87.2631307840.

The spelling of 664496 in words is "six hundred sixty-four thousand, four hundred ninety-six".