642822860840 has 64 divisors (see below), whose sum is σ = 1455070761360. Its totient is φ = 255579781120.

The previous prime is 642822860807. The next prime is 642822860843. The reversal of 642822860840 is 48068228246.

It can be written as a sum of positive squares in 8 ways, for example, as 372986247076 + 269836613764 = 610726^2 + 519458^2 .

It is not an unprimeable number, because it can be changed into a prime (642822860843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36397292 + ... + 36414948.

Almost surely, 2^642822860840 is an apocalyptic number.

It is an amenable number.

642822860840 is an abundant number, since it is smaller than the sum of its proper divisors (812247900520).

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

642822860840 is a wasteful number, since it uses less digits than its factorization.

642822860840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23102 (or 23098 counting only the distinct ones).

The product of its (nonzero) digits is 2359296, while the sum is 50.

The spelling of 642822860840 in words is "six hundred forty-two billion, eight hundred twenty-two million, eight hundred sixty thousand, eight hundred forty".