642066 has 16 divisors (see below), whose sum is σ = 1296864. Its totient is φ = 211904.

The previous prime is 642049. The next prime is 642071. The reversal of 642066 is 660246.

It is a zygodrome in base 9.

It is an unprimeable number.

642066 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 7 ways as a sum of consecutive naturals, for example, 205 + ... + 1151.

It is an arithmetic number, because the mean of its divisors is an integer number (81054).

2⁶⁴²⁰⁶⁶ is an apocalyptic number.

642066 is an abundant number, since it is smaller than the sum of its proper divisors (654798).

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

642066 is a wasteful number, since it uses less digits than its factorization.

642066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065.

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

The square root of 642066 is about 801.2902095995. The cubic root of 642066 is about 86.2700184578.

The spelling of 642066 in words is "six hundred forty-two thousand, sixty-six".