6615820 has 12 divisors (see below), whose sum is σ = 13893264. Its totient is φ = 2646320.

The previous prime is 6615809. The next prime is 6615853. The reversal of 6615820 is 285166.

6615820 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165376 + ... + 165415.

It is an arithmetic number, because the mean of its divisors is an integer number (1157772).

Almost surely, 2^6615820 is an apocalyptic number.

It is an amenable number.

6615820 is an abundant number, since it is smaller than the sum of its proper divisors (7277444).

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

6615820 is a wasteful number, since it uses less digits than its factorization.

6615820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330800 (or 330798 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 6615820 is about 2572.1236362197. The cubic root of 6615820 is about 187.7274986731.

The spelling of 6615820 in words is "six million, six hundred fifteen thousand, eight hundred twenty".