6638948 has 6 divisors (see below), whose sum is σ = 11618166. Its totient is φ = 3319472.

The previous prime is 6638911. The next prime is 6638953. The reversal of 6638948 is 8498366.

It can be written as a sum of positive squares in only one way, i.e., 5654884 + 984064 = 2378^2 + 992^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6638899 and 6638908.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 829865 + ... + 829872.

It is an arithmetic number, because the mean of its divisors is an integer number (1936361).

Almost surely, 2^6638948 is an apocalyptic number.

It is an amenable number.

6638948 is a deficient number, since it is larger than the sum of its proper divisors (4979218).

6638948 is a wasteful number, since it uses less digits than its factorization.

6638948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659741 (or 1659739 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 6638948 is about 2576.6156096709. The cubic root of 6638948 is about 187.9460007883.

The spelling of 6638948 in words is "six million, six hundred thirty-eight thousand, nine hundred forty-eight".