642755840782 has 48 divisors (see below), whose sum is σ = 1136574769680. Its totient is φ = 271562353920.

The previous prime is 642755840743. The next prime is 642755840897. The reversal of 642755840782 is 287048557246.

It is a congruent number.

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, 1075083 + ... + 1562470.

It is an arithmetic number, because the mean of its divisors is an integer number (23678641035).

Almost surely, 2^642755840782 is an apocalyptic number.

642755840782 is a deficient number, since it is larger than the sum of its proper divisors (493818928898).

642755840782 is a wasteful number, since it uses less digits than its factorization.

642755840782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637649 (or 2637638 counting only the distinct ones).

The product of its (nonzero) digits is 30105600, while the sum is 58.

The spelling of 642755840782 in words is "six hundred forty-two billion, seven hundred fifty-five million, eight hundred forty thousand, seven hundred eighty-two".