6638281 has 12 divisors (see below), whose sum is σ = 7367052. Its totient is φ = 5946048.

The previous prime is 6638273. The next prime is 6638299. The reversal of 6638281 is 1828366.

It can be written as a sum of positive squares in 6 ways, for example, as 512656 + 6125625 = 716^2 + 2475^2 .

It is not a de Polignac number, because 6638281 - 2³ = 6638273 is a prime.

It is a super-2 number, since 2×6638281² = 88133549269922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6638221) 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 11 ways as a sum of consecutive naturals, for example, 17611 + ... + 17983.

It is an arithmetic number, because the mean of its divisors is an integer number (613921).

Almost surely, 2^6638281 is an apocalyptic number.

It is an amenable number.

6638281 is a deficient number, since it is larger than the sum of its proper divisors (728771).

6638281 is a wasteful number, since it uses less digits than its factorization.

6638281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460 (or 423 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 6638281 is about 2576.4861730659. The cubic root of 6638281 is about 187.9397064084.

The spelling of 6638281 in words is "six million, six hundred thirty-eight thousand, two hundred eighty-one".