642757628862 has 128 divisors (see below), whose sum is σ = 1548589363200. Its totient is φ = 196826692608.

The previous prime is 642757628837. The next prime is 642757628869. The reversal of 642757628862 is 268826757246.

642757628862 is a `hidden beast` number, since 6 + 427 + 5 + 76 + 2 + 88 + 62 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 642757628862.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642757628869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 69430138 + ... + 69439394.

It is an arithmetic number, because the mean of its divisors is an integer number (12098354400).

Almost surely, 2^642757628862 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642757628862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (774294681600).

642757628862 is an abundant number, since it is smaller than the sum of its proper divisors (905831734338).

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

642757628862 is a wasteful number, since it uses less digits than its factorization.

642757628862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11087 (or 11081 counting only the distinct ones).

The product of its digits is 108380160, while the sum is 63.

The spelling of 642757628862 in words is "six hundred forty-two billion, seven hundred fifty-seven million, six hundred twenty-eight thousand, eight hundred sixty-two".