6638664 has 32 divisors (see below), whose sum is σ = 16708320. Its totient is φ = 2198016.

The previous prime is 6638647. The next prime is 6638669. The reversal of 6638664 is 4668366.

6638664 = T₂₀₀ + T₂₀₁ + ... + T₃₆₂.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (6638669) 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, 3064 + ... + 4760.

It is an arithmetic number, because the mean of its divisors is an integer number (522135).

Almost surely, 2^6638664 is an apocalyptic number.

It is an amenable number.

6638664 is an abundant number, since it is smaller than the sum of its proper divisors (10069656).

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

6638664 is a wasteful number, since it uses less digits than its factorization.

6638664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869 (or 1865 counting only the distinct ones).

The product of its digits is 124416, while the sum is 39.

The square root of 6638664 is about 2576.5604980283. The cubic root of 6638664 is about 187.9433207740.

The spelling of 6638664 in words is "six million, six hundred thirty-eight thousand, six hundred sixty-four".