642104 has 8 divisors (see below), whose sum is σ = 1203960. Its totient is φ = 321048.

The previous prime is 642079. The next prime is 642113. The reversal of 642104 is 401246.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40124 + ... + 40139.

It is an arithmetic number, because the mean of its divisors is an integer number (150495).

2⁶⁴²¹⁰⁴ is an apocalyptic number.

It is an amenable number.

642104 is a deficient number, since it is larger than the sum of its proper divisors (561856).

642104 is a wasteful number, since it uses less digits than its factorization.

642104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80269 (or 80265 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 642104 is about 801.3139210072. The cubic root of 642104 is about 86.2717203576.

The spelling of 642104 in words is "six hundred forty-two thousand, one hundred four".