128699781738 has 16 divisors (see below), whose sum is σ = 280799523936. Its totient is φ = 38999933840.

The previous prime is 128699781731. The next prime is 128699781739. The reversal of 128699781738 is 837187996821.

It is not an unprimeable number, because it can be changed into a prime (128699781731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 974998281 + ... + 974998412.

It is an arithmetic number, because the mean of its divisors is an integer number (17549970246).

Almost surely, 2^128699781738 is an apocalyptic number.

128699781738 is an abundant number, since it is smaller than the sum of its proper divisors (152099742198).

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

128699781738 is a wasteful number, since it uses less digits than its factorization.

128699781738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949996709.

The product of its digits is 73156608, while the sum is 69.

The spelling of 128699781738 in words is "one hundred twenty-eight billion, six hundred ninety-nine million, seven hundred eighty-one thousand, seven hundred thirty-eight".