7728421173 has 8 divisors (see below), whose sum is σ = 11241339936. Its totient is φ = 4683891600.

The previous prime is 7728421109. The next prime is 7728421193. The reversal of 7728421173 is 3711248277.

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

It is not a de Polignac number, because 7728421173 - 2⁶ = 7728421109 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7728421193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117097258 + ... + 117097323.

It is an arithmetic number, because the mean of its divisors is an integer number (1405167492).

Almost surely, 2^7728421173 is an apocalyptic number.

It is an amenable number.

7728421173 is a deficient number, since it is larger than the sum of its proper divisors (3512918763).

7728421173 is a wasteful number, since it uses less digits than its factorization.

7728421173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234194595.

The product of its digits is 131712, while the sum is 42.

The square root of 7728421173 is about 87911.4393750893. The cubic root of 7728421173 is about 1977.1073951856.

The spelling of 7728421173 in words is "seven billion, seven hundred twenty-eight million, four hundred twenty-one thousand, one hundred seventy-three".