6215220 has 144 divisors (see below), whose sum is σ = 21333312. Its totient is φ = 1451520.

The previous prime is 6215213. The next prime is 6215227. The reversal of 6215220 is 225126.

It is an interprime number because it is at equal distance from previous prime (6215213) and next prime (6215227).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 6215193 and 6215202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6215227) 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 47 ways as a sum of consecutive naturals, for example, 85104 + ... + 85176.

It is an arithmetic number, because the mean of its divisors is an integer number (148148).

Almost surely, 2^6215220 is an apocalyptic number.

6215220 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 6215220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10666656).

6215220 is an abundant number, since it is smaller than the sum of its proper divisors (15118092).

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

6215220 is a wasteful number, since it uses less digits than its factorization.

6215220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 6215220 is about 2493.0342957930. The cubic root of 6215220 is about 183.8592575272.

The spelling of 6215220 in words is "six million, two hundred fifteen thousand, two hundred twenty".