6638624 has 12 divisors (see below), whose sum is σ = 13069854. Its totient is φ = 3319296.

The previous prime is 6638617. The next prime is 6638627. The reversal of 6638624 is 4268366.

It can be written as a sum of positive squares in only one way, i.e., 6091024 + 547600 = 2468^2 + 740^2 .

It is a super-2 number, since 2×6638624² = 88142657226752, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6638627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103697 + ... + 103760.

Almost surely, 2^6638624 is an apocalyptic number.

It is an amenable number.

6638624 is a deficient number, since it is larger than the sum of its proper divisors (6431230).

6638624 is a wasteful number, since it uses less digits than its factorization.

6638624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207467 (or 207459 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The square root of 6638624 is about 2576.5527357304. The cubic root of 6638624 is about 187.9429433011.

The spelling of 6638624 in words is "six million, six hundred thirty-eight thousand, six hundred twenty-four".