642530 has 32 divisors (see below), whose sum is σ = 1351296. Its totient is φ = 215424.

The previous prime is 642529. The next prime is 642533. The reversal of 642530 is 35246.

642530 = 63² + 64² + ... + 129².

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4622 + ... + 4758.

It is an arithmetic number, because the mean of its divisors is an integer number (42228).

2⁶⁴²⁵³⁰ is an apocalyptic number.

642530 is an abundant number, since it is smaller than the sum of its proper divisors (708766).

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

642530 is a wasteful number, since it uses less digits than its factorization.

642530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 642530 is about 801.5796903615. The cubic root of 642530 is about 86.2907949563.

Adding to 642530 its reverse (35246), we get a palindrome (677776).

The spelling of 642530 in words is "six hundred forty-two thousand, five hundred thirty".