6638172 has 12 divisors (see below), whose sum is σ = 15489096. Its totient is φ = 2212720.

The previous prime is 6638167. The next prime is 6638179. The reversal of 6638172 is 2718366.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638179) 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 3 ways as a sum of consecutive naturals, for example, 276579 + ... + 276602.

It is an arithmetic number, because the mean of its divisors is an integer number (1290758).

Almost surely, 2^6638172 is an apocalyptic number.

It is an amenable number.

6638172 is an abundant number, since it is smaller than the sum of its proper divisors (8850924).

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

6638172 is a wasteful number, since it uses less digits than its factorization.

6638172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553188 (or 553186 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 6638172 is about 2576.4650201390. The cubic root of 6638172 is about 187.9386777516.

The spelling of 6638172 in words is "six million, six hundred thirty-eight thousand, one hundred seventy-two".