642758242764 has 24 divisors (see below), whose sum is σ = 1636111891008. Its totient is φ = 194775225040.

The previous prime is 642758242759. The next prime is 642758242769. The reversal of 642758242764 is 467242857246.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (642758242759) and next prime (642758242769).

It is not an unprimeable number, because it can be changed into a prime (642758242769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2434690182 + ... + 2434690445.

It is an arithmetic number, because the mean of its divisors is an integer number (68171328792).

Almost surely, 2^642758242764 is an apocalyptic number.

It is an amenable number.

642758242764 is an abundant number, since it is smaller than the sum of its proper divisors (993353648244).

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

642758242764 is a wasteful number, since it uses less digits than its factorization.

642758242764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4869380645 (or 4869380643 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 57.

The spelling of 642758242764 in words is "six hundred forty-two billion, seven hundred fifty-eight million, two hundred forty-two thousand, seven hundred sixty-four".