128528061 has 4 divisors (see below), whose sum is σ = 171370752. Its totient is φ = 85685372.

The previous prime is 128528053. The next prime is 128528063. The reversal of 128528061 is 160825821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128528061 - 2³ = 128528053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128528063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21421341 + ... + 21421346.

It is an arithmetic number, because the mean of its divisors is an integer number (42842688).

Almost surely, 2^128528061 is an apocalyptic number.

It is an amenable number.

128528061 is a deficient number, since it is larger than the sum of its proper divisors (42842691).

128528061 is an equidigital number, since it uses as much as digits as its factorization.

128528061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42842690.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 128528061 is about 11337.0216988414. The cubic root of 128528061 is about 504.6605057357.

The spelling of 128528061 in words is "one hundred twenty-eight million, five hundred twenty-eight thousand, sixty-one".