127728506 has 8 divisors (see below), whose sum is σ = 191678400. Its totient is φ = 63835708.

The previous prime is 127728481. The next prime is 127728511. The reversal of 127728506 is 605827721.

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

It is a self number, because there is not a number n which added to its sum of digits gives 127728506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8156 + ... + 17943.

It is an arithmetic number, because the mean of its divisors is an integer number (23959800).

Almost surely, 2^127728506 is an apocalyptic number.

127728506 is a deficient number, since it is larger than the sum of its proper divisors (63949894).

127728506 is a wasteful number, since it uses less digits than its factorization.

127728506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28548.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 127728506 is about 11301.7036768799. The cubic root of 127728506 is about 503.6118541940.

The spelling of 127728506 in words is "one hundred twenty-seven million, seven hundred twenty-eight thousand, five hundred six".