6444620 has 48 divisors (see below), whose sum is σ = 16661568. Its totient is φ = 2039040.

The previous prime is 6444619. The next prime is 6444631. The reversal of 6444620 is 264446.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 6444620.

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, 50 + ... + 3590.

It is an arithmetic number, because the mean of its divisors is an integer number (347116).

Almost surely, 2^6444620 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 6444620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8330784).

6444620 is an abundant number, since it is smaller than the sum of its proper divisors (10216948).

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

6444620 is a wasteful number, since it uses less digits than its factorization.

6444620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570 (or 3568 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 6444620 is about 2538.6256124131. The cubic root of 6444620 is about 186.0940288439.

The spelling of 6444620 in words is "six million, four hundred forty-four thousand, six hundred twenty".