3223728 has 60 divisors (see below), whose sum is σ = 9194848. Its totient is φ = 1054080.

The previous prime is 3223709. The next prime is 3223729. The reversal of 3223728 is 8273223.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3223729) 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, 8601 + ... + 8967.

Almost surely, 2^3223728 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 3223728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4597424).

3223728 is an abundant number, since it is smaller than the sum of its proper divisors (5971120).

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

3223728 is a wasteful number, since it uses less digits than its factorization.

3223728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 433 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 3223728 is about 1795.4743105932. The cubic root of 3223728 is about 147.7245913001.

The spelling of 3223728 in words is "three million, two hundred twenty-three thousand, seven hundred twenty-eight".