642085 has 8 divisors (see below), whose sum is σ = 774936. Its totient is φ = 510720.

The previous prime is 642079. The next prime is 642113. The reversal of 642085 is 580246.

It can be written as a sum of positive squares in 4 ways, for example, as 214369 + 427716 = 463^2 + 654^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642085 - 2³ = 642077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1177 + ... + 1633.

It is an arithmetic number, because the mean of its divisors is an integer number (96867).

2⁶⁴²⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

642085 is a deficient number, since it is larger than the sum of its proper divisors (132851).

642085 is a wasteful number, since it uses less digits than its factorization.

642085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 642085 is about 801.3020653911. The cubic root of 642085 is about 86.2708694161.

The spelling of 642085 in words is "six hundred forty-two thousand, eighty-five".