642008 has 8 divisors (see below), whose sum is σ = 1203780. Its totient is φ = 321000.

The previous prime is 641981. The next prime is 642011. The reversal of 642008 is 800246.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

642008 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40118 + ... + 40133.

2⁶⁴²⁰⁰⁸ is an apocalyptic number.

It is an amenable number.

642008 is a deficient number, since it is larger than the sum of its proper divisors (561772).

642008 is a wasteful number, since it uses less digits than its factorization.

642008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80257 (or 80253 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 642008 is about 801.2540171506. The cubic root of 642008 is about 86.2674206917.

The spelling of 642008 in words is "six hundred forty-two thousand, eight".