1328885840 has 40 divisors (see below), whose sum is σ = 3252276960. Its totient is φ = 503577216.

The previous prime is 1328885819. The next prime is 1328885911. The reversal of 1328885840 is 485888231.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 435614 + ... + 438653.

It is an arithmetic number, because the mean of its divisors is an integer number (81306924).

Almost surely, 2^1328885840 is an apocalyptic number.

1328885840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1328885840 is an abundant number, since it is smaller than the sum of its proper divisors (1923391120).

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

1328885840 is a wasteful number, since it uses less digits than its factorization.

1328885840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874299 (or 874293 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 47.

The square root of 1328885840 is about 36453.8864869029. The cubic root of 1328885840 is about 1099.4172781361.

The spelling of 1328885840 in words is "one billion, three hundred twenty-eight million, eight hundred eighty-five thousand, eight hundred forty".