664435 has 4 divisors (see below), whose sum is σ = 797328. Its totient is φ = 531544.

The previous prime is 664427. The next prime is 664441. The reversal of 664435 is 534466.

664435 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 534466 = 2 ⋅267233.

It is a cyclic number.

It is not a de Polignac number, because 664435 - 2³ = 664427 is a prime.

It is a Duffinian number.

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, 66439 + ... + 66448.

It is an arithmetic number, because the mean of its divisors is an integer number (199332).

2⁶⁶⁴⁴³⁵ is an apocalyptic number.

664435 is a deficient number, since it is larger than the sum of its proper divisors (132893).

664435 is a wasteful number, since it uses less digits than its factorization.

664435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132892.

The product of its digits is 8640, while the sum is 28.

The square root of 664435 is about 815.1288241744. The cubic root of 664435 is about 87.2604604826.

The spelling of 664435 in words is "six hundred sixty-four thousand, four hundred thirty-five".