7128641 has 8 divisors (see below), whose sum is σ = 7714560. Its totient is φ = 6548112.

The previous prime is 7128619. The next prime is 7128647. The reversal of 7128641 is 1468217.

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-7128641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7128647) 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, 1670 + ... + 4128.

It is an arithmetic number, because the mean of its divisors is an integer number (964320).

Almost surely, 2^7128641 is an apocalyptic number.

It is an amenable number.

7128641 is a deficient number, since it is larger than the sum of its proper divisors (585919).

7128641 is a wasteful number, since it uses less digits than its factorization.

7128641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2695.

The product of its digits is 2688, while the sum is 29.

The square root of 7128641 is about 2669.9514976868. The cubic root of 7128641 is about 192.4578285087.

The spelling of 7128641 in words is "seven million, one hundred twenty-eight thousand, six hundred forty-one".