1328402816 has 32 divisors (see below), whose sum is σ = 2850002400. Its totient is φ = 613108224.

The previous prime is 1328402813. The next prime is 1328402821. The reversal of 1328402816 is 6182048231.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328402813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397496 + ... + 400823.

It is an arithmetic number, because the mean of its divisors is an integer number (89062575).

Almost surely, 2^1328402816 is an apocalyptic number.

1328402816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1328402816 is an abundant number, since it is smaller than the sum of its proper divisors (1521599584).

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

1328402816 is an equidigital number, since it uses as much as digits as its factorization.

1328402816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798346 (or 798334 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 1328402816 is about 36447.2607475514. The cubic root of 1328402816 is about 1099.2840564377.

The spelling of 1328402816 in words is "one billion, three hundred twenty-eight million, four hundred two thousand, eight hundred sixteen".