128982729 has 8 divisors (see below), whose sum is σ = 172351872. Its totient is φ = 85801040.

The previous prime is 128982727. The next prime is 128982739. The reversal of 128982729 is 927289821.

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 128982729 - 2¹ = 128982727 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128982727) 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, 45249 + ... + 48014.

It is an arithmetic number, because the mean of its divisors is an integer number (21543984).

Almost surely, 2^128982729 is an apocalyptic number.

It is an amenable number.

128982729 is a deficient number, since it is larger than the sum of its proper divisors (43369143).

128982729 is an equidigital number, since it uses as much as digits as its factorization.

128982729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93727.

The product of its digits is 290304, while the sum is 48.

The square root of 128982729 is about 11357.0563527703. The cubic root of 128982729 is about 505.2548842401.

The spelling of 128982729 in words is "one hundred twenty-eight million, nine hundred eighty-two thousand, seven hundred twenty-nine".