642630 has 32 divisors (see below), whose sum is σ = 1594368. Its totient is φ = 165600.

The previous prime is 642623. The next prime is 642673. The reversal of 642630 is 36246.

642630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 642597 and 642606.

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 642630.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 585 + ... + 1275.

It is an arithmetic number, because the mean of its divisors is an integer number (49824).

2⁶⁴²⁶³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (797184).

642630 is an abundant number, since it is smaller than the sum of its proper divisors (951738).

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

642630 is a wasteful number, since it uses less digits than its factorization.

642630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 642630 is about 801.6420647646. The cubic root of 642630 is about 86.2952713397.

Adding to 642630 its reverse (36246), we get a palindrome (678876).

The spelling of 642630 in words is "six hundred forty-two thousand, six hundred thirty".