6557740 has 48 divisors (see below), whose sum is σ = 16257024. Its totient is φ = 2174400.

The previous prime is 6557731. The next prime is 6557753. The reversal of 6557740 is 477556.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6557696 and 6557705.

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 15 ways as a sum of consecutive naturals, for example, 3585 + ... + 5095.

It is an arithmetic number, because the mean of its divisors is an integer number (338688).

Almost surely, 2^6557740 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 6557740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8128512).

6557740 is an abundant number, since it is smaller than the sum of its proper divisors (9699284).

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

6557740 is a wasteful number, since it uses less digits than its factorization.

6557740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558 (or 1556 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 6557740 is about 2560.8084660903. The cubic root of 6557740 is about 187.1765326586.

The spelling of 6557740 in words is "six million, five hundred fifty-seven thousand, seven hundred forty".