3421728 has 54 divisors (see below), whose sum is σ = 9820629. Its totient is φ = 1130112.

The previous prime is 3421711. The next prime is 3421751. The reversal of 3421728 is 8271243.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 3283344 + 138384 = 1812^2 + 372^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1308.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 31338 + ... + 31446.

Almost surely, 2^3421728 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 3421728

3421728 is an abundant number, since it is smaller than the sum of its proper divisors (6398901).

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

3421728 is a wasteful number, since it uses less digits than its factorization.

3421728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 114 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 3421728 is about 1849.7913395840. The cubic root of 3421728 is about 150.6890961291.

The spelling of 3421728 in words is "three million, four hundred twenty-one thousand, seven hundred twenty-eight".