128382781858868 has 24 divisors (see below), whose sum is σ = 234718264567080. Its totient is φ = 61364252163200.

The previous prime is 128382781858847. The next prime is 128382781858921. The reversal of 128382781858868 is 868858187283821.

It can be written as a sum of positive squares in 4 ways, for example, as 39275940770704 + 89106841088164 = 6267052^2 + 9439642^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5478939371 + ... + 5478962802.

It is an arithmetic number, because the mean of its divisors is an integer number (9779927690295).

Almost surely, 2^{128382781858868} is an apocalyptic number.

It is an amenable number.

128382781858868 is a deficient number, since it is larger than the sum of its proper divisors (106335482708212).

128382781858868 is a wasteful number, since it uses less digits than its factorization.

128382781858868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10957902307 (or 10957902305 counting only the distinct ones).

The product of its digits is 5284823040, while the sum is 83.

The spelling of 128382781858868 in words is "one hundred twenty-eight trillion, three hundred eighty-two billion, seven hundred eighty-one million, eight hundred fifty-eight thousand, eight hundred sixty-eight".