1285321328 has 40 divisors (see below), whose sum is σ = 2612192928. Its totient is φ = 611500032.

The previous prime is 1285321327. The next prime is 1285321337. The reversal of 1285321328 is 8231235821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285321327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61976 + ... + 80072.

Almost surely, 2^1285321328 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 1285321328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1306096464).

1285321328 is an abundant number, since it is smaller than the sum of its proper divisors (1326871600).

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

1285321328 is a wasteful number, since it uses less digits than its factorization.

1285321328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18321 (or 18315 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 1285321328 is about 35851.3783277575. The cubic root of 1285321328 is about 1087.2695816578.

The spelling of 1285321328 in words is "one billion, two hundred eighty-five million, three hundred twenty-one thousand, three hundred twenty-eight".