642860 has 12 divisors (see below), whose sum is σ = 1350048. Its totient is φ = 257136.

The previous prime is 642853. The next prime is 642869. The reversal of 642860 is 68246.

It is not an unprimeable number, because it can be changed into a prime (642869) by changing a digit.

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, 16052 + ... + 16091.

It is an arithmetic number, because the mean of its divisors is an integer number (112504).

2⁶⁴²⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

642860 is an abundant number, since it is smaller than the sum of its proper divisors (707188).

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

642860 is a wasteful number, since it uses less digits than its factorization.

642860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32152 (or 32150 counting only the distinct ones).

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

The square root of 642860 is about 801.7855074769. The cubic root of 642860 is about 86.3055652594.

The spelling of 642860 in words is "six hundred forty-two thousand, eight hundred sixty".