642622 has 4 divisors (see below), whose sum is σ = 963936. Its totient is φ = 321310.

The previous prime is 642613. The next prime is 642623. The reversal of 642622 is 226246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 226246 = 2 ⋅113123.

It is a junction number, because it is equal to n+sod(n) for n = 642593 and 642602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160654 + ... + 160657.

It is an arithmetic number, because the mean of its divisors is an integer number (240984).

2⁶⁴²⁶²² is an apocalyptic number.

642622 is a deficient number, since it is larger than the sum of its proper divisors (321314).

642622 is a wasteful number, since it uses less digits than its factorization.

642622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321313.

The product of its digits is 1152, while the sum is 22.

The square root of 642622 is about 801.6370749909. The cubic root of 642622 is about 86.2949132461.

Adding to 642622 its reverse (226246), we get a palindrome (868868).

The spelling of 642622 in words is "six hundred forty-two thousand, six hundred twenty-two".