664236 has 18 divisors (see below), whose sum is σ = 1679132. Its totient is φ = 221400.

The previous prime is 664211. The next prime is 664243. The reversal of 664236 is 632466.

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9190 + ... + 9261.

2⁶⁶⁴²³⁶ is an apocalyptic number.

It is an amenable number.

664236 is an abundant number, since it is smaller than the sum of its proper divisors (1014896).

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

664236 is a wasteful number, since it uses less digits than its factorization.

664236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18461 (or 18456 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 664236 is about 815.0067484383. The cubic root of 664236 is about 87.2517480349.

It can be divided in two parts, 664 and 236, that added together give a square (900 = 30²).

The spelling of 664236 in words is "six hundred sixty-four thousand, two hundred thirty-six".