6639480 has 48 divisors (see below), whose sum is σ = 21579480. Its totient is φ = 1770432.

The previous prime is 6639467. The next prime is 6639481. The reversal of 6639480 is 849366.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8862 + ... + 9581.

Almost surely, 2^6639480 is an apocalyptic number.

6639480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6639480 is an abundant number, since it is smaller than the sum of its proper divisors (14940000).

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

6639480 is a wasteful number, since it uses less digits than its factorization.

6639480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18460 (or 18453 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6639480 is about 2576.7188438012. The cubic root of 6639480 is about 187.9510208909.

The spelling of 6639480 in words is "six million, six hundred thirty-nine thousand, four hundred eighty".