128729563 has 4 divisors (see below), whose sum is σ = 130911480. Its totient is φ = 126547648.

The previous prime is 128729561. The next prime is 128729567. The reversal of 128729563 is 365927821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128729563 - 2¹ = 128729561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128729561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090870 + ... + 1090987.

It is an arithmetic number, because the mean of its divisors is an integer number (32727870).

Almost surely, 2^128729563 is an apocalyptic number.

128729563 is a deficient number, since it is larger than the sum of its proper divisors (2181917).

128729563 is an equidigital number, since it uses as much as digits as its factorization.

128729563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181916.

The product of its digits is 181440, while the sum is 43.

The square root of 128729563 is about 11345.9051203507. The cubic root of 128729563 is about 504.9240979935.

The spelling of 128729563 in words is "one hundred twenty-eight million, seven hundred twenty-nine thousand, five hundred sixty-three".