642285 has 24 divisors (see below), whose sum is σ = 1272960. Its totient is φ = 293472.

The previous prime is 642281. The next prime is 642359. The reversal of 642285 is 582246.

It is not a de Polignac number, because 642285 - 2² = 642281 is a prime.

It is an Ulam number.

642285 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 705 + ... + 1334.

It is an arithmetic number, because the mean of its divisors is an integer number (53040).

2⁶⁴²²⁸⁵ is an apocalyptic number.

It is an amenable number.

642285 is a deficient number, since it is larger than the sum of its proper divisors (630675).

642285 is a wasteful number, since it uses less digits than its factorization.

642285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057 (or 2054 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 642285 is about 801.4268525574. The cubic root of 642285 is about 86.2798258537.

The spelling of 642285 in words is "six hundred forty-two thousand, two hundred eighty-five".