7128644 has 24 divisors (see below), whose sum is σ = 13386240. Its totient is φ = 3309696.

The previous prime is 7128619. The next prime is 7128647. The reversal of 7128644 is 4468217.

It is a self number, because there is not a number n which added to its sum of digits gives 7128644.

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, 4709 + ... + 6035.

It is an arithmetic number, because the mean of its divisors is an integer number (557760).

Almost surely, 2^7128644 is an apocalyptic number.

It is an amenable number.

7128644 is a deficient number, since it is larger than the sum of its proper divisors (6257596).

7128644 is a wasteful number, since it uses less digits than its factorization.

7128644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427 (or 1425 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 7128644 is about 2669.9520594947. The cubic root of 7128644 is about 192.4578555065.

The spelling of 7128644 in words is "seven million, one hundred twenty-eight thousand, six hundred forty-four".