128048721 has 8 divisors (see below), whose sum is σ = 170884320. Its totient is φ = 85289472.

The previous prime is 128048681. The next prime is 128048737. The reversal of 128048721 is 127840821.

It is a happy number.

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

It is not a de Polignac number, because 128048721 - 2⁷ = 128048593 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (128048761) 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, 15051 + ... + 21968.

It is an arithmetic number, because the mean of its divisors is an integer number (21360540).

Almost surely, 2^128048721 is an apocalyptic number.

It is an amenable number.

128048721 is a deficient number, since it is larger than the sum of its proper divisors (42835599).

128048721 is a wasteful number, since it uses less digits than its factorization.

128048721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38175.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 128048721 is about 11315.8614784735. The cubic root of 128048721 is about 504.0323541525.

The spelling of 128048721 in words is "one hundred twenty-eight million, forty-eight thousand, seven hundred twenty-one".