6618420 has 72 divisors (see below), whose sum is σ = 20363616. Its totient is φ = 1739712.

The previous prime is 6618419. The next prime is 6618421. The reversal of 6618420 is 248166.

6618420 is a `hidden beast` number, since 6 + 618 + 42 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (6618419) and next prime (6618421).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6618421) 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 23 ways as a sum of consecutive naturals, for example, 14719 + ... + 15161.

It is an arithmetic number, because the mean of its divisors is an integer number (282828).

Almost surely, 2^6618420 is an apocalyptic number.

6618420 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 6618420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10181808).

6618420 is an abundant number, since it is smaller than the sum of its proper divisors (13745196).

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

6618420 is a wasteful number, since it uses less digits than its factorization.

6618420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541 (or 536 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 6618420 is about 2572.6290055117. The cubic root of 6618420 is about 187.7520875913.

The spelling of 6618420 in words is "six million, six hundred eighteen thousand, four hundred twenty".