6646416 has 80 divisors (see below), whose sum is σ = 19903488. Its totient is φ = 1872000.

The previous prime is 6646403. The next prime is 6646417. The reversal of 6646416 is 6146466.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43941 + ... + 44091.

Almost surely, 2^6646416 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 6646416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9951744).

6646416 is an abundant number, since it is smaller than the sum of its proper divisors (13257072).

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

6646416 is a wasteful number, since it uses less digits than its factorization.

6646416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 294 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 6646416 is about 2578.0643901966. The cubic root of 6646416 is about 188.0164464260.

The spelling of 6646416 in words is "six million, six hundred forty-six thousand, four hundred sixteen".