642606 has 8 divisors (see below), whose sum is σ = 1285224. Its totient is φ = 214200.

The previous prime is 642581. The next prime is 642613. The reversal of 642606 is 606246.

It is a sphenic number, since it is the product of 3 distinct primes.

642606 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable 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 in 3 ways as a sum of consecutive naturals, for example, 53545 + ... + 53556.

It is an arithmetic number, because the mean of its divisors is an integer number (160653).

2⁶⁴²⁶⁰⁶ is an apocalyptic number.

642606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

642606 is a wasteful number, since it uses less digits than its factorization.

642606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107106.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 642606 is about 801.6270953505. The cubic root of 642606 is about 86.2941970500.

The spelling of 642606 in words is "six hundred forty-two thousand, six hundred six".