642286 has 4 divisors (see below), whose sum is σ = 963432. Its totient is φ = 321142.

The previous prime is 642281. The next prime is 642359. The reversal of 642286 is 682246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 682246 = 2 ⋅341123.

It is a plaindrome in base 16.

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 as a sum of consecutive naturals, namely, 160570 + ... + 160573.

It is an arithmetic number, because the mean of its divisors is an integer number (240858).

2⁶⁴²²⁸⁶ is an apocalyptic number.

642286 is a deficient number, since it is larger than the sum of its proper divisors (321146).

642286 is a wasteful number, since it uses less digits than its factorization.

642286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321145.

The product of its digits is 4608, while the sum is 28.

The square root of 642286 is about 801.4274764444. The cubic root of 642286 is about 86.2798706312.

The spelling of 642286 in words is "six hundred forty-two thousand, two hundred eighty-six".