642287 has 4 divisors (see below), whose sum is σ = 646536. Its totient is φ = 638040.

The previous prime is 642281. The next prime is 642359. The reversal of 642287 is 782246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642287 - 2⁶ = 642223 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642287.

It is not an unprimeable number, because it can be changed into a prime (642281) 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, 1889 + ... + 2202.

It is an arithmetic number, because the mean of its divisors is an integer number (161634).

2⁶⁴²²⁸⁷ is an apocalyptic number.

642287 is a deficient number, since it is larger than the sum of its proper divisors (4249).

642287 is a wasteful number, since it uses less digits than its factorization.

642287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4248.

The product of its digits is 5376, while the sum is 29.

The square root of 642287 is about 801.4281003309. The cubic root of 642287 is about 86.2799154087.

It can be divided in two parts, 642 and 287, that added together give a palindrome (929).

The spelling of 642287 in words is "six hundred forty-two thousand, two hundred eighty-seven".