128394387754 has 32 divisors (see below), whose sum is σ = 198645909840. Its totient is φ = 62211581952.

The previous prime is 128394387703. The next prime is 128394387757. The reversal of 128394387754 is 457783493821.

It can be written as a sum of positive squares in 8 ways, for example, as 55641733225 + 72752654529 = 235885^2 + 269727^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128394387692 and 128394387701.

It is not an unprimeable number, because it can be changed into a prime (128394387757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5221272 + ... + 5245804.

Almost surely, 2^128394387754 is an apocalyptic number.

128394387754 is a deficient number, since it is larger than the sum of its proper divisors (70251522086).

128394387754 is a wasteful number, since it uses less digits than its factorization.

128394387754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25194.

The product of its digits is 40642560, while the sum is 61.

The spelling of 128394387754 in words is "one hundred twenty-eight billion, three hundred ninety-four million, three hundred eighty-seven thousand, seven hundred fifty-four".