3257728 has 32 divisors (see below), whose sum is σ = 6707520. Its totient is φ = 1574400.

The previous prime is 3257719. The next prime is 3257731. The reversal of 3257728 is 8277523.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×3257728² = 21225583443968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3257693 and 3257702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3558 + ... + 4378.

It is an arithmetic number, because the mean of its divisors is an integer number (209610).

Almost surely, 2^3257728 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 3257728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3353760).

3257728 is an abundant number, since it is smaller than the sum of its proper divisors (3449792).

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

3257728 is an equidigital number, since it uses as much as digits as its factorization.

3257728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 854 counting only the distinct ones).

The product of its digits is 23520, while the sum is 34.

The square root of 3257728 is about 1804.9177266568. The cubic root of 3257728 is about 148.2421164833.

The spelling of 3257728 in words is "three million, two hundred fifty-seven thousand, seven hundred twenty-eight".