3185728 has 56 divisors (see below), whose sum is σ = 7794752. Its totient is φ = 1257984.

The previous prime is 3185723. The next prime is 3185729. The reversal of 3185728 is 8275813.

3185728 is nontrivially palindromic in base 3.

It is a tau number, because it is divible by the number of its divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 3185693 and 3185702.

It is not an unprimeable number, because it can be changed into a prime (3185723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5551 + ... + 6097.

It is an arithmetic number, because the mean of its divisors is an integer number (139192).

Almost surely, 2^3185728 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 3185728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3897376).

3185728 is an abundant number, since it is smaller than the sum of its proper divisors (4609024).

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

3185728 is a wasteful number, since it uses less digits than its factorization.

3185728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579 (or 569 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 3185728 is about 1784.8607788844. The cubic root of 3185728 is about 147.1418563685.

The spelling of 3185728 in words is "three million, one hundred eighty-five thousand, seven hundred twenty-eight".