1328921078 has 4 divisors (see below), whose sum is σ = 1993381620. Its totient is φ = 664460538.

The previous prime is 1328921057. The next prime is 1328921089. The reversal of 1328921078 is 8701298231.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332230268 + ... + 332230271.

It is an arithmetic number, because the mean of its divisors is an integer number (498345405).

Almost surely, 2^1328921078 is an apocalyptic number.

1328921078 is a deficient number, since it is larger than the sum of its proper divisors (664460542).

1328921078 is an equidigital number, since it uses as much as digits as its factorization.

1328921078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664460541.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 1328921078 is about 36454.3698066501. The cubic root of 1328921078 is about 1099.4269957814.

The spelling of 1328921078 in words is "one billion, three hundred twenty-eight million, nine hundred twenty-one thousand, seventy-eight".