642006 has 24 divisors (see below), whose sum is σ = 1443624. Its totient is φ = 213840.

The previous prime is 641981. The next prime is 642011. The reversal of 642006 is 600246.

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

It is a self number, because there is not a number n which added to its sum of digits gives 642006.

It is a congruent number.

It is an unprimeable number.

642006 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 11 ways as a sum of consecutive naturals, for example, 175 + ... + 1146.

It is an arithmetic number, because the mean of its divisors is an integer number (60151).

2⁶⁴²⁰⁰⁶ is an apocalyptic number.

642006 is an abundant number, since it is smaller than the sum of its proper divisors (801618).

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

642006 is a wasteful number, since it uses less digits than its factorization.

642006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 1326 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 642006 is about 801.2527691060. The cubic root of 642006 is about 86.2673311108.

The spelling of 642006 in words is "six hundred forty-two thousand, six".