642522 has 16 divisors (see below), whose sum is σ = 1294560. Its totient is φ = 212592.

The previous prime is 642517. The next prime is 642527. The reversal of 642522 is 225246.

It is an interprime number because it is at equal distance from previous prime (642517) and next prime (642527).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642522.

It is not an unprimeable number, because it can be changed into a prime (642527) by changing a digit.

642522 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729 + ... + 1347.

It is an arithmetic number, because the mean of its divisors is an integer number (80910).

2⁶⁴²⁵²² is an apocalyptic number.

642522 is an abundant number, since it is smaller than the sum of its proper divisors (652038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642522 is a wasteful number, since it uses less digits than its factorization.

642522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797.

The product of its digits is 960, while the sum is 21.

The square root of 642522 is about 801.5747001996. The cubic root of 642522 is about 86.2904368255.

Adding to 642522 its reverse (225246), we get a palindrome (867768).

The spelling of 642522 in words is "six hundred forty-two thousand, five hundred twenty-two".