6550440 has 192 divisors, whose sum is σ = 23716800. Its totient is φ = 1437696.

The previous prime is 6550417. The next prime is 6550471. The reversal of 6550440 is 440556.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 6550440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 344751 + ... + 344769.

It is an arithmetic number, because the mean of its divisors is an integer number (123525).

Almost surely, 2^6550440 is an apocalyptic number.

6550440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6550440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11858400).

6550440 is an abundant number, since it is smaller than the sum of its proper divisors (17166360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6550440 is a wasteful number, since it uses less digits than its factorization.

6550440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 6550440 is about 2559.3827380835. The cubic root of 6550440 is about 187.1070526234.

Adding to 6550440 its reverse (440556), we get a palindrome (6990996).

It can be divided in two parts, 65 and 50440, that added together give a palindrome (50505).

The spelling of 6550440 in words is "six million, five hundred fifty thousand, four hundred forty".