7128663 has 8 divisors (see below), whose sum is σ = 9532800. Its totient is φ = 4738488.

The previous prime is 7128647. The next prime is 7128673. The reversal of 7128663 is 3668217.

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

It is not a de Polignac number, because 7128663 - 2⁴ = 7128647 is a prime.

7128663 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7128673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2233 + ... + 4386.

It is an arithmetic number, because the mean of its divisors is an integer number (1191600).

Almost surely, 2^7128663 is an apocalyptic number.

7128663 is a deficient number, since it is larger than the sum of its proper divisors (2404137).

7128663 is a wasteful number, since it uses less digits than its factorization.

7128663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6981.

The product of its digits is 12096, while the sum is 33.

The square root of 7128663 is about 2669.9556176087. The cubic root of 7128663 is about 192.4580264926.

The spelling of 7128663 in words is "seven million, one hundred twenty-eight thousand, six hundred sixty-three".