664434 has 12 divisors (see below), whose sum is σ = 1439646. Its totient is φ = 221472.

The previous prime is 664427. The next prime is 664441. The reversal of 664434 is 434466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664427) and next prime (664441).

It can be written as a sum of positive squares in only one way, i.e., 356409 + 308025 = 597^2 + 555^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 664398 and 664407.

It is an unprimeable number.

664434 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 5 ways as a sum of consecutive naturals, for example, 18439 + ... + 18474.

2⁶⁶⁴⁴³⁴ is an apocalyptic number.

664434 is an abundant number, since it is smaller than the sum of its proper divisors (775212).

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

664434 is a wasteful number, since it uses less digits than its factorization.

664434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36921 (or 36918 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 664434 is about 815.1282107742. The cubic root of 664434 is about 87.2604167058.

The spelling of 664434 in words is "six hundred sixty-four thousand, four hundred thirty-four".