6516440 has 96 divisors (see below), whose sum is σ = 18234720. Its totient is φ = 2045952.

The previous prime is 6516439. The next prime is 6516463. The reversal of 6516440 is 446156.

It is a happy number.

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 23 ways as a sum of consecutive naturals, for example, 176102 + ... + 176138.

It is an arithmetic number, because the mean of its divisors is an integer number (189945).

Almost surely, 2^6516440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6516440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9117360).

6516440 is an abundant number, since it is smaller than the sum of its proper divisors (11718280).

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

6516440 is a wasteful number, since it uses less digits than its factorization.

6516440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 6516440 is about 2552.7318699777. The cubic root of 6516440 is about 186.7827650785.

The spelling of 6516440 in words is "six million, five hundred sixteen thousand, four hundred forty".