6557220 has 48 divisors (see below), whose sum is σ = 20401920. Its totient is φ = 1748448.

The previous prime is 6557207. The next prime is 6557233. The reversal of 6557220 is 227556.

6557220 is a `hidden beast` number, since 655 + 7 + 2 + 2 + 0 = 666.

6557220 is nontrivially palindromic in base 14.

It is an interprime number because it is at equal distance from previous prime (6557207) and next prime (6557233).

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5532 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (425040).

Almost surely, 2^6557220 is an apocalyptic number.

6557220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6557220 is an abundant number, since it is smaller than the sum of its proper divisors (13844700).

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

6557220 is a wasteful number, since it uses less digits than its factorization.

6557220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12161 (or 12153 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 6557220 is about 2560.7069336416. The cubic root of 6557220 is about 187.1715851020.

It can be divided in two parts, 655 and 7220, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 6557220 in words is "six million, five hundred fifty-seven thousand, two hundred twenty".