642670 has 16 divisors (see below), whose sum is σ = 1322208. Its totient is φ = 220320.

The previous prime is 642623. The next prime is 642673. The reversal of 642670 is 76246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642673) by changing a digit.

642670 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, 4521 + ... + 4660.

It is an arithmetic number, because the mean of its divisors is an integer number (82638).

2⁶⁴²⁶⁷⁰ is an apocalyptic number.

642670 is an abundant number, since it is smaller than the sum of its proper divisors (679538).

It is a weird number, because it is abundant, but not a pseudoperfect number.

642670 is a wasteful number, since it uses less digits than its factorization.

642670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9195.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 642670 is about 801.6670131669. The cubic root of 642670 is about 86.2970617630.

The spelling of 642670 in words is "six hundred forty-two thousand, six hundred seventy".