1328491890 has 48 divisors (see below), whose sum is σ = 3768088896. Its totient is φ = 322058400.

The previous prime is 1328491889. The next prime is 1328491933. The reversal of 1328491890 is 981948231.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 669966 + ... + 671945.

It is an arithmetic number, because the mean of its divisors is an integer number (78501852).

Almost surely, 2^1328491890 is an apocalyptic number.

1328491890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1328491890 is an abundant number, since it is smaller than the sum of its proper divisors (2439597006).

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

1328491890 is a wasteful number, since it uses less digits than its factorization.

1328491890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341935 (or 1341932 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 1328491890 is about 36448.4826844685. The cubic root of 1328491890 is about 1099.3086261537.

The spelling of 1328491890 in words is "one billion, three hundred twenty-eight million, four hundred ninety-one thousand, eight hundred ninety".