128727061 has 4 divisors (see below), whose sum is σ = 128786112. Its totient is φ = 128668012.

The previous prime is 128727041. The next prime is 128727101. The reversal of 128727061 is 160727821.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 160727821 = 19 ⋅8459359.

It is a cyclic number.

It is not a de Polignac number, because 128727061 - 2⁵ = 128727029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128727041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26125 + ... + 30658.

It is an arithmetic number, because the mean of its divisors is an integer number (32196528).

Almost surely, 2^128727061 is an apocalyptic number.

It is an amenable number.

128727061 is a deficient number, since it is larger than the sum of its proper divisors (59051).

128727061 is an equidigital number, since it uses as much as digits as its factorization.

128727061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59050.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 128727061 is about 11345.7948597707. The cubic root of 128727061 is about 504.9208267214.

The spelling of 128727061 in words is "one hundred twenty-eight million, seven hundred twenty-seven thousand, sixty-one".