1721285328 has 60 divisors (see below), whose sum is σ = 5172645120. Its totient is φ = 491795136.

The previous prime is 1721285327. The next prime is 1721285347. The reversal of 1721285328 is 8235821271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721285327) 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, 363568 + ... + 368271.

It is an arithmetic number, because the mean of its divisors is an integer number (86210752).

Almost surely, 2^1721285328 is an apocalyptic number.

It is an amenable number.

1721285328 is an abundant number, since it is smaller than the sum of its proper divisors (3451359792).

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

1721285328 is a wasteful number, since it uses less digits than its factorization.

1721285328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731864 (or 731851 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 1721285328 is about 41488.3758178119. The cubic root of 1721285328 is about 1198.4436601556.

The spelling of 1721285328 in words is "one billion, seven hundred twenty-one million, two hundred eighty-five thousand, three hundred twenty-eight".