6215820 has 72 divisors (see below), whose sum is σ = 18876816. Its totient is φ = 1527552.

The previous prime is 6215813. The next prime is 6215851. The reversal of 6215820 is 285126.

6215820 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9834 + ... + 10446.

It is an arithmetic number, because the mean of its divisors is an integer number (262178).

Almost surely, 2^6215820 is an apocalyptic number.

6215820 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 6215820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9438408).

6215820 is an abundant number, since it is smaller than the sum of its proper divisors (12660996).

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

6215820 is a wasteful number, since it uses less digits than its factorization.

6215820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 6215820 is about 2493.1546281769. The cubic root of 6215820 is about 183.8651737568.

It can be divided in two parts, 621 and 5820, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 6215820 in words is "six million, two hundred fifteen thousand, eight hundred twenty".