128835561 has 8 divisors (see below), whose sum is σ = 180821920. Its totient is φ = 81369792.

The previous prime is 128835559. The next prime is 128835563. The reversal of 128835561 is 165538821.

It is an interprime number because it is at equal distance from previous prime (128835559) and next prime (128835563).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128835561 - 2¹ = 128835559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128835563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1130080 + ... + 1130193.

It is an arithmetic number, because the mean of its divisors is an integer number (22602740).

Almost surely, 2^128835561 is an apocalyptic number.

It is an amenable number.

128835561 is a deficient number, since it is larger than the sum of its proper divisors (51986359).

128835561 is a wasteful number, since it uses less digits than its factorization.

128835561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260295.

The product of its digits is 57600, while the sum is 39.

The square root of 128835561 is about 11350.5753598661. The cubic root of 128835561 is about 505.0626475232.

The spelling of 128835561 in words is "one hundred twenty-eight million, eight hundred thirty-five thousand, five hundred sixty-one".