6557920 has 48 divisors (see below), whose sum is σ = 16411248. Its totient is φ = 2467840.

The previous prime is 6557867. The next prime is 6557939. The reversal of 6557920 is 297556.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1515 + ... + 3925.

It is an arithmetic number, because the mean of its divisors is an integer number (341901).

Almost surely, 2^6557920 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 6557920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8205624).

6557920 is an abundant number, since it is smaller than the sum of its proper divisors (9853328).

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

6557920 is a wasteful number, since it uses less digits than its factorization.

6557920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443 (or 2435 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 6557920 is about 2560.8436110001. The cubic root of 6557920 is about 187.1782452134.

The spelling of 6557920 in words is "six million, five hundred fifty-seven thousand, nine hundred twenty".