6555220 has 36 divisors (see below), whose sum is σ = 16015860. Its totient is φ = 2247168.

The previous prime is 6555173. The next prime is 6555223. The reversal of 6555220 is 225556.

It can be written as a sum of positive squares in 2 ways, for example, as 4008004 + 2547216 = 2002^2 + 1596^2 .

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2365 + ... + 4324.

It is an arithmetic number, because the mean of its divisors is an integer number (444885).

Almost surely, 2^6555220 is an apocalyptic number.

It is an amenable number.

6555220 is an abundant number, since it is smaller than the sum of its proper divisors (9460640).

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

6555220 is a wasteful number, since it uses less digits than its factorization.

6555220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6712 (or 6703 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 6555220 is about 2560.3163866991. The cubic root of 6555220 is about 187.1525536001.

The spelling of 6555220 in words is "six million, five hundred fifty-five thousand, two hundred twenty".