6440888 has 8 divisors (see below), whose sum is σ = 12076680. Its totient is φ = 3220440.

The previous prime is 6440881. The next prime is 6440891. The reversal of 6440888 is 8880446.

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

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402548 + ... + 402563.

It is an arithmetic number, because the mean of its divisors is an integer number (1509585).

Almost surely, 2^6440888 is an apocalyptic number.

It is an amenable number.

6440888 is a deficient number, since it is larger than the sum of its proper divisors (5635792).

6440888 is a wasteful number, since it uses less digits than its factorization.

6440888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805117 (or 805113 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

The square root of 6440888 is about 2537.8904625693. The cubic root of 6440888 is about 186.0581003217.

The spelling of 6440888 in words is "six million, four hundred forty thousand, eight hundred eighty-eight".