6623428 has 36 divisors (see below), whose sum is σ = 13789440. Its totient is φ = 2774352.

The previous prime is 6623423. The next prime is 6623459. The reversal of 6623428 is 8243266.

It is a self number, because there is not a number n which added to its sum of digits gives 6623428.

It is not an unprimeable number, because it can be changed into a prime (6623423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8853 + ... + 9571.

It is an arithmetic number, because the mean of its divisors is an integer number (383040).

Almost surely, 2^6623428 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 6623428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6894720).

6623428 is an abundant number, since it is smaller than the sum of its proper divisors (7166012).

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

6623428 is a wasteful number, since it uses less digits than its factorization.

6623428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784 (or 775 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 6623428 is about 2573.6021448546. The cubic root of 6623428 is about 187.7994314889.

The spelling of 6623428 in words is "six million, six hundred twenty-three thousand, four hundred twenty-eight".