128442387028 has 12 divisors (see below), whose sum is σ = 225938811700. Its totient is φ = 63888440832.

The previous prime is 128442387023. The next prime is 128442387089. The reversal of 128442387028 is 820783244821.

It can be written as a sum of positive squares in 2 ways, for example, as 79327849104 + 49114537924 = 281652^2 + 221618^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128442387023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83187303 + ... + 83188846.

Almost surely, 2^128442387028 is an apocalyptic number.

It is an amenable number.

128442387028 is a deficient number, since it is larger than the sum of its proper divisors (97496424672).

128442387028 is a wasteful number, since it uses less digits than its factorization.

128442387028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166376346 (or 166376344 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 49.

The spelling of 128442387028 in words is "one hundred twenty-eight billion, four hundred forty-two million, three hundred eighty-seven thousand, twenty-eight".