6638646 has 32 divisors (see below), whose sum is σ = 15257088. Its totient is φ = 1886400.

The previous prime is 6638633. The next prime is 6638647. The reversal of 6638646 is 6468366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638647) 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 15 ways as a sum of consecutive naturals, for example, 10746 + ... + 11346.

It is an arithmetic number, because the mean of its divisors is an integer number (476784).

Almost surely, 2^6638646 is an apocalyptic number.

6638646 is an abundant number, since it is smaller than the sum of its proper divisors (8618442).

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

6638646 is a wasteful number, since it uses less digits than its factorization.

6638646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876.

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

The square root of 6638646 is about 2576.5570049972. The cubic root of 6638646 is about 187.9431509114.

The spelling of 6638646 in words is "six million, six hundred thirty-eight thousand, six hundred forty-six".