6639754 has 12 divisors (see below), whose sum is σ = 10947762. Its totient is φ = 3017960.

The previous prime is 6639739. The next prime is 6639757. The reversal of 6639754 is 4579366.

It can be written as a sum of positive squares in only one way, i.e., 5593225 + 1046529 = 2365^2 + 1023^2 .

It is a d-powerful number, because it can be written as 6 + 6⁸ + 3¹¹ + 9⁷ + 7 + 5 + 4 .

It is not an unprimeable number, because it can be changed into a prime (6639757) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13477 + ... + 13960.

Almost surely, 2^6639754 is an apocalyptic number.

6639754 is a deficient number, since it is larger than the sum of its proper divisors (4308008).

6639754 is a wasteful number, since it uses less digits than its factorization.

6639754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27461 (or 27450 counting only the distinct ones).

The product of its digits is 136080, while the sum is 40.

The square root of 6639754 is about 2576.7720116456. The cubic root of 6639754 is about 187.9536063279.

The spelling of 6639754 in words is "six million, six hundred thirty-nine thousand, seven hundred fifty-four".