1304503728 has 80 divisors (see below), whose sum is σ = 3761890176. Its totient is φ = 386104320.

The previous prime is 1304503703. The next prime is 1304503799. The reversal of 1304503728 is 8273054031.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6025 + ... + 51432.

Almost surely, 2^1304503728 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 1304503728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1880945088).

1304503728 is an abundant number, since it is smaller than the sum of its proper divisors (2457386448).

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

1304503728 is a wasteful number, since it uses less digits than its factorization.

1304503728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57522 (or 57516 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 1304503728 is about 36117.9142254920. The cubic root of 1304503728 is about 1092.6517731496.

Adding to 1304503728 its reverse (8273054031), we get a palindrome (9577557759).

The spelling of 1304503728 in words is "one billion, three hundred four million, five hundred three thousand, seven hundred twenty-eight".