6639232 has 16 divisors (see below), whose sum is σ = 13226850. Its totient is φ = 3319552.

The previous prime is 6639223. The next prime is 6639233. The reversal of 6639232 is 2329366.

It can be written as a sum of positive squares in only one way, i.e., 6431296 + 207936 = 2536^2 + 456^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6639194 and 6639203.

It is not an unprimeable number, because it can be changed into a prime (6639233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25807 + ... + 26062.

Almost surely, 2^6639232 is an apocalyptic number.

It is an amenable number.

6639232 is a deficient number, since it is larger than the sum of its proper divisors (6587618).

6639232 is an equidigital number, since it uses as much as digits as its factorization.

6639232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51883 (or 51871 counting only the distinct ones).

The product of its digits is 11664, while the sum is 31.

The square root of 6639232 is about 2576.6707201348. The cubic root of 6639232 is about 187.9486807261.

The spelling of 6639232 in words is "six million, six hundred thirty-nine thousand, two hundred thirty-two".