128528421075 has 18 divisors (see below), whose sum is σ = 230208683484. Its totient is φ = 68548491120.

The previous prime is 128528421071. The next prime is 128528421089. The reversal of 128528421075 is 570124825821.

128528421075 is a `hidden beast` number, since 1 + 2 + 8 + 528 + 42 + 10 + 75 = 666.

It is not a de Polignac number, because 128528421075 - 2² = 128528421071 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 128528421075.

It is not an unprimeable number, because it can be changed into a prime (128528421071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 285618489 + ... + 285618938.

Almost surely, 2^128528421075 is an apocalyptic number.

128528421075 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128528421075 is a deficient number, since it is larger than the sum of its proper divisors (101680262409).

128528421075 is a wasteful number, since it uses less digits than its factorization.

128528421075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571237443 (or 571237435 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The spelling of 128528421075 in words is "one hundred twenty-eight billion, five hundred twenty-eight million, four hundred twenty-one thousand, seventy-five".