6651904 has 64 divisors (see below), whose sum is σ = 15728400. Its totient is φ = 2752512.

The previous prime is 6651857. The next prime is 6651907. The reversal of 6651904 is 4091566.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229362 + ... + 229390.

Almost surely, 2^6651904 is an apocalyptic number.

6651904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6651904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7864200).

6651904 is an abundant number, since it is smaller than the sum of its proper divisors (9076496).

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

6651904 is an frugal number, since it uses more digits than its factorization.

6651904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 6651904 is about 2579.1285349901. The cubic root of 6651904 is about 188.0681810947.

The spelling of 6651904 in words is "six million, six hundred fifty-one thousand, nine hundred four".