6557664 has 48 divisors (see below), whose sum is σ = 17442432. Its totient is φ = 2156928.

The previous prime is 6557659. The next prime is 6557671. The reversal of 6557664 is 4667556.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7557 + ... + 8379.

It is an arithmetic number, because the mean of its divisors is an integer number (363384).

Almost surely, 2^6557664 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 6557664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8721216).

6557664 is an abundant number, since it is smaller than the sum of its proper divisors (10884768).

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

6557664 is a wasteful number, since it uses less digits than its factorization.

6557664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 911 counting only the distinct ones).

The product of its digits is 151200, while the sum is 39.

The square root of 6557664 is about 2560.7936269836. The cubic root of 6557664 is about 187.1758095705.

The spelling of 6557664 in words is "six million, five hundred fifty-seven thousand, six hundred sixty-four".