6645770 has 16 divisors (see below), whose sum is σ = 12076128. Its totient is φ = 2633040.

The previous prime is 6645757. The next prime is 6645787. The reversal of 6645770 is 775466.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6645770.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2036 + ... + 4175.

It is an arithmetic number, because the mean of its divisors is an integer number (754758).

Almost surely, 2^6645770 is an apocalyptic number.

6645770 is a deficient number, since it is larger than the sum of its proper divisors (5430358).

6645770 is a wasteful number, since it uses less digits than its factorization.

6645770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6325.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 6645770 is about 2577.9390993582. The cubic root of 6645770 is about 188.0103547941.

The spelling of 6645770 in words is "six million, six hundred forty-five thousand, seven hundred seventy".