128729663 has 8 divisors (see below), whose sum is σ = 131751360. Its totient is φ = 125719840.

The previous prime is 128729641. The next prime is 128729669. The reversal of 128729663 is 366927821.

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 128729663 - 2⁸ = 128729407 is a prime.

It is a super-2 number, since 2×128729663² = 33142652272187138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128729669) 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, 21233 + ... + 26613.

It is an arithmetic number, because the mean of its divisors is an integer number (16468920).

Almost surely, 2^128729663 is an apocalyptic number.

128729663 is a deficient number, since it is larger than the sum of its proper divisors (3021697).

128729663 is an equidigital number, since it uses as much as digits as its factorization.

128729663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5937.

The product of its digits is 217728, while the sum is 44.

The square root of 128729663 is about 11345.9095272261. The cubic root of 128729663 is about 504.9242287389.

The spelling of 128729663 in words is "one hundred twenty-eight million, seven hundred twenty-nine thousand, six hundred sixty-three".