642642105380 has 72 divisors (see below), whose sum is σ = 1487664771264. Its totient is φ = 233014281280.

The previous prime is 642642105377. The next prime is 642642105397. The reversal of 642642105380 is 83501246246.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 457097 + ... + 1222383.

It is an arithmetic number, because the mean of its divisors is an integer number (20662010712).

Almost surely, 2^642642105380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642642105380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (743832385632).

642642105380 is an abundant number, since it is smaller than the sum of its proper divisors (845022665884).

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

642642105380 is a wasteful number, since it uses less digits than its factorization.

642642105380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765665 (or 765652 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 642642105380 in words is "six hundred forty-two billion, six hundred forty-two million, one hundred five thousand, three hundred eighty".