6639534 has 24 divisors (see below), whose sum is σ = 15693912. Its totient is φ = 2011920.

The previous prime is 6639533. The next prime is 6639547. The reversal of 6639534 is 4359366.

It is a d-powerful number, because it can be written as 6 + 6 + 3¹³ + 9² + 5 + 3¹⁴ + 4⁹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16569 + ... + 16964.

It is an arithmetic number, because the mean of its divisors is an integer number (653913).

Almost surely, 2^6639534 is an apocalyptic number.

6639534 is an abundant number, since it is smaller than the sum of its proper divisors (9054378).

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

6639534 is a wasteful number, since it uses less digits than its factorization.

6639534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33552 (or 33549 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 6639534 is about 2576.7293222223. The cubic root of 6639534 is about 187.9515304352.

The spelling of 6639534 in words is "six million, six hundred thirty-nine thousand, five hundred thirty-four".