3281663728 has 30 divisors (see below), whose sum is σ = 7267883784. Its totient is φ = 1406167488.

The previous prime is 3281663683. The next prime is 3281663729. The reversal of 3281663728 is 8273661823.

3281663728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3281663729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 603550 + ... + 608962.

Almost surely, 2^3281663728 is an apocalyptic number.

It is an amenable number.

3281663728 is an abundant number, since it is smaller than the sum of its proper divisors (3986220056).

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

3281663728 is an frugal number, since it uses more digits than its factorization.

3281663728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10841 (or 5422 counting only the distinct ones).

The product of its digits is 580608, while the sum is 46.

The square root of 3281663728 is about 57285.8073871705. The cubic root of 3281663728 is about 1486.0429405995.

The spelling of 3281663728 in words is "three billion, two hundred eighty-one million, six hundred sixty-three thousand, seven hundred twenty-eight".