7128643 has 8 divisors (see below), whose sum is σ = 7562016. Its totient is φ = 6705600.

The previous prime is 7128619. The next prime is 7128647. The reversal of 7128643 is 3468217.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7128643 is a prime.

It is a Duffinian number.

7128643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7128647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1138 + ... + 3943.

It is an arithmetic number, because the mean of its divisors is an integer number (945252).

Almost surely, 2^7128643 is an apocalyptic number.

7128643 is a deficient number, since it is larger than the sum of its proper divisors (433373).

7128643 is a wasteful number, since it uses less digits than its factorization.

7128643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5165.

The product of its digits is 8064, while the sum is 31.

The square root of 7128643 is about 2669.9518722254. The cubic root of 7128643 is about 192.4578465073.

The spelling of 7128643 in words is "seven million, one hundred twenty-eight thousand, six hundred forty-three".