664834 has 4 divisors (see below), whose sum is σ = 997254. Its totient is φ = 332416.

The previous prime is 664799. The next prime is 664843. The reversal of 664834 is 438466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 124609 = 735^2 + 353^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664796 and 664805.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166207 + ... + 166210.

2⁶⁶⁴⁸³⁴ is an apocalyptic number.

664834 is a deficient number, since it is larger than the sum of its proper divisors (332420).

664834 is a wasteful number, since it uses less digits than its factorization.

664834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332419.

The product of its digits is 13824, while the sum is 31.

The square root of 664834 is about 815.3735340321. The cubic root of 664834 is about 87.2779239198.

It can be divided in two parts, 66 and 4834, that added together give a square (4900 = 70²).

The spelling of 664834 in words is "six hundred sixty-four thousand, eight hundred thirty-four".