642204 has 18 divisors (see below), whose sum is σ = 1623440. Its totient is φ = 214056.

The previous prime is 642199. The next prime is 642211. The reversal of 642204 is 402246.

642204 is a `hidden beast` number, since 642 + 20 + 4 = 666.

642204 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

642204 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, 8884 + ... + 8955.

2⁶⁴²²⁰⁴ is an apocalyptic number.

It is an amenable number.

642204 is an abundant number, since it is smaller than the sum of its proper divisors (981236).

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

642204 is a wasteful number, since it uses less digits than its factorization.

642204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17849 (or 17844 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 642204 is about 801.3763160963. The cubic root of 642204 is about 86.2761987205.

The spelling of 642204 in words is "six hundred forty-two thousand, two hundred four".