6440788 has 12 divisors (see below), whose sum is σ = 11292372. Its totient is φ = 3214400.

The previous prime is 6440783. The next prime is 6440789. The reversal of 6440788 is 8870446.

It can be written as a sum of positive squares in 2 ways, for example, as 4401604 + 2039184 = 2098^2 + 1428^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1656 + ... + 3952.

It is an arithmetic number, because the mean of its divisors is an integer number (941031).

Almost surely, 2^6440788 is an apocalyptic number.

It is an amenable number.

6440788 is a deficient number, since it is larger than the sum of its proper divisors (4851584).

6440788 is a wasteful number, since it uses less digits than its factorization.

6440788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002 (or 3000 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 6440788 is about 2537.8707610909. The cubic root of 6440788 is about 186.0571374159.

The spelling of 6440788 in words is "six million, four hundred forty thousand, seven hundred eighty-eight".