642080 has 24 divisors (see below), whose sum is σ = 1517292. Its totient is φ = 256768.

The previous prime is 642079. The next prime is 642113. The reversal of 642080 is 80246.

It can be written as a sum of positive squares in 2 ways, for example, as 633616 + 8464 = 796^2 + 92^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1847 + ... + 2166.

2⁶⁴²⁰⁸⁰ is an apocalyptic number.

It is an amenable number.

642080 is an abundant number, since it is smaller than the sum of its proper divisors (875212).

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

642080 is a wasteful number, since it uses less digits than its factorization.

642080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028 (or 4020 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 642080 is about 801.2989454629. The cubic root of 642080 is about 86.2706454813.

The spelling of 642080 in words is "six hundred forty-two thousand, eighty".