6557720 has 32 divisors (see below), whose sum is σ = 15891120. Its totient is φ = 2421120.

The previous prime is 6557693. The next prime is 6557723. The reversal of 6557720 is 277556.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6557723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5786 + ... + 6825.

Almost surely, 2^6557720 is an apocalyptic number.

It is an amenable number.

6557720 is an abundant number, since it is smaller than the sum of its proper divisors (9333400).

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

6557720 is a wasteful number, since it uses less digits than its factorization.

6557720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12635 (or 12631 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 32.

The square root of 6557720 is about 2560.8045610706. The cubic root of 6557720 is about 187.1763423728.

The spelling of 6557720 in words is "six million, five hundred fifty-seven thousand, seven hundred twenty".