6643470 has 32 divisors (see below), whose sum is σ = 16174080. Its totient is φ = 1746080.

The previous prime is 6643453. The next prime is 6643487. The reversal of 6643470 is 743466.

It is an interprime number because it is at equal distance from previous prime (6643453) and next prime (6643487).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 571 + ... + 3689.

It is an arithmetic number, because the mean of its divisors is an integer number (505440).

Almost surely, 2^6643470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6643470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8087040).

6643470 is an abundant number, since it is smaller than the sum of its proper divisors (9530610).

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

6643470 is a wasteful number, since it uses less digits than its factorization.

6643470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200.

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 6643470 is about 2577.4929679826. The cubic root of 6643470 is about 187.9886631160.

Adding to 6643470 its product of nonzero digits (12096), we get a palindrome (6655566).

The spelling of 6643470 in words is "six million, six hundred forty-three thousand, four hundred seventy".