6636420 has 144 divisors (see below), whose sum is σ = 24111360. Its totient is φ = 1444608.

The previous prime is 6636359. The next prime is 6636433. The reversal of 6636420 is 246366.

6636420 is a `hidden beast` number, since 6 + 636 + 4 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28866 + ... + 29094.

It is an arithmetic number, because the mean of its divisors is an integer number (167440).

Almost surely, 2^6636420 is an apocalyptic number.

6636420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6636420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12055680).

6636420 is an abundant number, since it is smaller than the sum of its proper divisors (17474940).

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

6636420 is a wasteful number, since it uses less digits than its factorization.

6636420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 6636420 is about 2576.1249969673. The cubic root of 6636420 is about 187.9221421985.

It can be divided in two parts, 6636 and 420, that added together give a square (7056 = 84²).

The spelling of 6636420 in words is "six million, six hundred thirty-six thousand, four hundred twenty".