1285984328 has 8 divisors (see below), whose sum is σ = 2411220630. Its totient is φ = 642992160.

The previous prime is 1285984327. The next prime is 1285984457. The reversal of 1285984328 is 8234895821.

It can be written as a sum of positive squares in only one way, i.e., 673817764 + 612166564 = 25958^2 + 24742^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1285984328² = 3307511383723223168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1285984327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80374013 + ... + 80374028.

Almost surely, 2^1285984328 is an apocalyptic number.

It is an amenable number.

1285984328 is a deficient number, since it is larger than the sum of its proper divisors (1125236302).

1285984328 is a wasteful number, since it uses less digits than its factorization.

1285984328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160748047 (or 160748043 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 50.

The square root of 1285984328 is about 35860.6236420952. The cubic root of 1285984328 is about 1087.4564962207.

The spelling of 1285984328 in words is "one billion, two hundred eighty-five million, nine hundred eighty-four thousand, three hundred twenty-eight".