6638247 has 64 divisors (see below), whose sum is σ = 12779520. Its totient is φ = 3304800.

The previous prime is 6638231. The next prime is 6638249. The reversal of 6638247 is 7428366.

It is not a de Polignac number, because 6638247 - 2⁴ = 6638231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638249) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 64398 + ... + 64500.

It is an arithmetic number, because the mean of its divisors is an integer number (199680).

Almost surely, 2^6638247 is an apocalyptic number.

6638247 is a deficient number, since it is larger than the sum of its proper divisors (6141273).

6638247 is a wasteful number, since it uses less digits than its factorization.

6638247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 155 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 6638247 is about 2576.4795749239. The cubic root of 6638247 is about 187.9393855442.

The spelling of 6638247 in words is "six million, six hundred thirty-eight thousand, two hundred forty-seven".