6551688 has 128 divisors (see below), whose sum is σ = 20321280. Its totient is φ = 1731840.

The previous prime is 6551653. The next prime is 6551689. The reversal of 6551688 is 8861556.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (6551689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78895 + ... + 78977.

It is an arithmetic number, because the mean of its divisors is an integer number (158760).

Almost surely, 2^6551688 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 6551688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10160640).

6551688 is an abundant number, since it is smaller than the sum of its proper divisors (13769592).

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

6551688 is a wasteful number, since it uses less digits than its factorization.

6551688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 135 counting only the distinct ones).

The product of its digits is 57600, while the sum is 39.

The square root of 6551688 is about 2559.6265352586. The cubic root of 6551688 is about 187.1189345109.

The spelling of 6551688 in words is "six million, five hundred fifty-one thousand, six hundred eighty-eight".