642263 has 4 divisors (see below), whose sum is σ = 664440. Its totient is φ = 620088.

The previous prime is 642253. The next prime is 642281. The reversal of 642263 is 362246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 362246 = 2 ⋅181123.

It is a cyclic number.

It is not a de Polignac number, because 642263 - 2⁴ = 642247 is a prime.

It is a super-2 number, since 2×642263² = 825003522338, which contains 22 as substring.

It is a Duffinian number.

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 642263.

It is not an unprimeable number, because it can be changed into a prime (642223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11045 + ... + 11102.

It is an arithmetic number, because the mean of its divisors is an integer number (166110).

2⁶⁴²²⁶³ is an apocalyptic number.

642263 is a deficient number, since it is larger than the sum of its proper divisors (22177).

642263 is a wasteful number, since it uses less digits than its factorization.

642263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22176.

The product of its digits is 1728, while the sum is 23.

The square root of 642263 is about 801.4131269202. The cubic root of 642263 is about 86.2788407366.

The spelling of 642263 in words is "six hundred forty-two thousand, two hundred sixty-three".