642346122 has 64 divisors (see below), whose sum is σ = 1524127104. Its totient is φ = 178237440.

The previous prime is 642346109. The next prime is 642346141. The reversal of 642346122 is 221643246.

It is a self number, because there is not a number n which added to its sum of digits gives 642346122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33778 + ... + 49250.

It is an arithmetic number, because the mean of its divisors is an integer number (23814486).

Almost surely, 2^642346122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642346122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762063552).

642346122 is an abundant number, since it is smaller than the sum of its proper divisors (881780982).

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

642346122 is a wasteful number, since it uses less digits than its factorization.

642346122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15543.

The product of its digits is 13824, while the sum is 30.

The square root of 642346122 is about 25344.5481711551. The cubic root of 642346122 is about 862.8256265965.

Adding to 642346122 its reverse (221643246), we get a palindrome (863989368).

The spelling of 642346122 in words is "six hundred forty-two million, three hundred forty-six thousand, one hundred twenty-two".