1328833781 has 16 divisors (see below), whose sum is σ = 1536433920. Its totient is φ = 1135841280.

The previous prime is 1328833777. The next prime is 1328833801. The reversal of 1328833781 is 1873388231.

It is a cyclic number.

It is not a de Polignac number, because 1328833781 - 2² = 1328833777 is a prime.

It is a super-2 number, since 2×1328833781² = 3531598435053511922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328833721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224660 + ... + 230498.

It is an arithmetic number, because the mean of its divisors is an integer number (96027120).

Almost surely, 2^1328833781 is an apocalyptic number.

1328833781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1328833781 is a deficient number, since it is larger than the sum of its proper divisors (207600139).

1328833781 is a wasteful number, since it uses less digits than its factorization.

1328833781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7084.

The product of its digits is 193536, while the sum is 44.

The square root of 1328833781 is about 36453.1724408178. The cubic root of 1328833781 is about 1099.4029214197.

The spelling of 1328833781 in words is "one billion, three hundred twenty-eight million, eight hundred thirty-three thousand, seven hundred eighty-one".