6221628 has 54 divisors (see below), whose sum is σ = 18299736. Its totient is φ = 1777104.

The previous prime is 6221591. The next prime is 6221629. The reversal of 6221628 is 8261226.

6221628 is a `hidden beast` number, since 622 + 16 + 28 = 666.

6221628 is a nontrivial binomial coefficient, being equal to C(3528, 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6221629) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1 + ... + 3527.

It is an arithmetic number, because the mean of its divisors is an integer number (338884).

Almost surely, 2^6221628 is an apocalyptic number.

6221628 is the 3527-th triangular number and also the 1764-th hexagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6221628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9149868).

6221628 is an abundant number, since it is smaller than the sum of its proper divisors (12078108).

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

6221628 is a wasteful number, since it uses less digits than its factorization.

6221628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3551 (or 3539 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 6221628 is about 2494.3191455786. The cubic root of 6221628 is about 183.9224231888.

It can be divided in two parts, 622162 and 8, that added together give a triangular number (622170 = T₁₁₁₅).

The spelling of 6221628 in words is "six million, two hundred twenty-one thousand, six hundred twenty-eight".