6645928 has 8 divisors (see below), whose sum is σ = 12461130. Its totient is φ = 3322960.

The previous prime is 6645923. The next prime is 6645943. The reversal of 6645928 is 8295466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5560164 + 1085764 = 2358^2 + 1042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (6645923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415363 + ... + 415378.

Almost surely, 2^6645928 is an apocalyptic number.

It is an amenable number.

6645928 is a deficient number, since it is larger than the sum of its proper divisors (5815202).

6645928 is a wasteful number, since it uses less digits than its factorization.

6645928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830747 (or 830743 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 6645928 is about 2577.9697438100. The cubic root of 6645928 is about 188.0118447343.

The spelling of 6645928 in words is "six million, six hundred forty-five thousand, nine hundred twenty-eight".