6639512 has 48 divisors (see below), whose sum is σ = 14443800. Its totient is φ = 2859120.

The previous prime is 6639511. The next prime is 6639527. The reversal of 6639512 is 2159366.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639511) 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, 349439 + ... + 349457.

Almost surely, 2^6639512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6639512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7221900).

6639512 is an abundant number, since it is smaller than the sum of its proper divisors (7804288).

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

6639512 is a wasteful number, since it uses less digits than its factorization.

6639512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 32 counting only the distinct ones).

The product of its digits is 9720, while the sum is 32.

The square root of 6639512 is about 2576.7250532410. The cubic root of 6639512 is about 187.9513228435.

The spelling of 6639512 in words is "six million, six hundred thirty-nine thousand, five hundred twelve".