642608 has 10 divisors (see below), whose sum is σ = 1245084. Its totient is φ = 321296.

The previous prime is 642581. The next prime is 642613. The reversal of 642608 is 806246.

It is an unprimeable number.

642608 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 as a sum of consecutive naturals, namely, 20066 + ... + 20097.

2⁶⁴²⁶⁰⁸ is an apocalyptic number.

It is an amenable number.

642608 is a deficient number, since it is larger than the sum of its proper divisors (602476).

642608 is a wasteful number, since it uses less digits than its factorization.

642608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40171 (or 40165 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 642608 is about 801.6283428123. The cubic root of 642608 is about 86.2942865752.

The spelling of 642608 in words is "six hundred forty-two thousand, six hundred eight".