642044 has 12 divisors (see below), whose sum is σ = 1210104. Its totient is φ = 296304.

The previous prime is 642013. The next prime is 642049. The reversal of 642044 is 440246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6122 + ... + 6225.

It is an arithmetic number, because the mean of its divisors is an integer number (100842).

2⁶⁴²⁰⁴⁴ is an apocalyptic number.

It is an amenable number.

642044 is a deficient number, since it is larger than the sum of its proper divisors (568060).

642044 is a wasteful number, since it uses less digits than its factorization.

642044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12364 (or 12362 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 642044 is about 801.2764816217. The cubic root of 642044 is about 86.2690331167.

It can be divided in two parts, 64 and 2044, that multiplied together give a triangular number (130816 = T₅₁₁).

The spelling of 642044 in words is "six hundred forty-two thousand, forty-four".