642255 has 16 divisors (see below), whose sum is σ = 1050624. Its totient is φ = 334880.

The previous prime is 642253. The next prime is 642281. The reversal of 642255 is 552246.

It is not a de Polignac number, because 642255 - 2¹ = 642253 is a prime.

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 642255.

It is not an unprimeable number, because it can be changed into a prime (642253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250 + ... + 1160.

It is an arithmetic number, because the mean of its divisors is an integer number (65664).

2⁶⁴²²⁵⁵ is an apocalyptic number.

642255 is a deficient number, since it is larger than the sum of its proper divisors (408369).

642255 is a wasteful number, since it uses less digits than its factorization.

642255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966.

The product of its digits is 2400, while the sum is 24.

The square root of 642255 is about 801.4081357211. The cubic root of 642255 is about 86.2784825066.

Subtracting from 642255 its reverse (552246), we obtain a palindrome (90009).

The spelling of 642255 in words is "six hundred forty-two thousand, two hundred fifty-five".