6221664 has 96 divisors (see below), whose sum is σ = 19152000. Its totient is φ = 1959552.

The previous prime is 6221651. The next prime is 6221671. The reversal of 6221664 is 4661226.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 16227 + ... + 16605.

It is an arithmetic number, because the mean of its divisors is an integer number (199500).

Almost surely, 2^6221664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6221664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9576000).

6221664 is an abundant number, since it is smaller than the sum of its proper divisors (12930336).

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

6221664 is a wasteful number, since it uses less digits than its factorization.

6221664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 403 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 6221664 is about 2494.3263619663. The cubic root of 6221664 is about 183.9227779295.

It can be divided in two parts, 622166 and 4, that added together give a triangular number (622170 = T₁₁₁₅).

The spelling of 6221664 in words is "six million, two hundred twenty-one thousand, six hundred sixty-four".