128616081 has 16 divisors (see below), whose sum is σ = 189873408. Its totient is φ = 76784400.

The previous prime is 128616077. The next prime is 128616091. The reversal of 128616081 is 180616821.

It is not a de Polignac number, because 128616081 - 2² = 128616077 is a prime.

It is a super-2 number, since 2×128616081² = 33084192583597122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128616031) 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 15 ways as a sum of consecutive naturals, for example, 26875 + ... + 31296.

It is an arithmetic number, because the mean of its divisors is an integer number (11867088).

Almost surely, 2^128616081 is an apocalyptic number.

128616081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128616081 is a deficient number, since it is larger than the sum of its proper divisors (61257327).

128616081 is a wasteful number, since it uses less digits than its factorization.

128616081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58252.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 128616081 is about 11340.9030063748. The cubic root of 128616081 is about 504.7756818332.

The spelling of 128616081 in words is "one hundred twenty-eight million, six hundred sixteen thousand, eighty-one".