6551820 has 96 divisors (see below), whose sum is σ = 22256640. Its totient is φ = 1586880.

The previous prime is 6551801. The next prime is 6551821. The reversal of 6551820 is 281556.

6551820 is a `hidden beast` number, since 655 + 1 + 8 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (6551821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5389 + ... + 6491.

It is an arithmetic number, because the mean of its divisors is an integer number (231840).

Almost surely, 2^6551820 is an apocalyptic number.

6551820 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 6551820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11128320).

6551820 is an abundant number, since it is smaller than the sum of its proper divisors (15704820).

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

6551820 is a wasteful number, since it uses less digits than its factorization.

6551820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132 (or 1124 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 6551820 is about 2559.6523201404. The cubic root of 6551820 is about 187.1201911608.

The spelling of 6551820 in words is "six million, five hundred fifty-one thousand, eight hundred twenty".