128800561 has 8 divisors (see below), whose sum is σ = 129771200. Its totient is φ = 127833552.

The previous prime is 128800559. The next prime is 128800583. The reversal of 128800561 is 165008821.

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

It is a cyclic number.

It is not a de Polignac number, because 128800561 - 2¹ = 128800559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128800531) 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, 145426 + ... + 146308.

It is an arithmetic number, because the mean of its divisors is an integer number (16221400).

Almost surely, 2^128800561 is an apocalyptic number.

It is an amenable number.

128800561 is a deficient number, since it is larger than the sum of its proper divisors (970639).

128800561 is an equidigital number, since it uses as much as digits as its factorization.

128800561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1815.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 128800561 is about 11349.0334830769. The cubic root of 128800561 is about 505.0169075802.

The spelling of 128800561 in words is "one hundred twenty-eight million, eight hundred thousand, five hundred sixty-one".