1328557698 has 48 divisors (see below), whose sum is σ = 3113630520. Its totient is φ = 406985472.

The previous prime is 1328557661. The next prime is 1328557709. The reversal of 1328557698 is 8967558231.

1328557698 is a `hidden beast` number, since 1 + 3 + 28 + 557 + 69 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1328383809 + 173889 = 36447^2 + 417^2 .

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 23 ways as a sum of consecutive naturals, for example, 41190 + ... + 65982.

Almost surely, 2^1328557698 is an apocalyptic number.

1328557698 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1328557698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1556815260).

1328557698 is an abundant number, since it is smaller than the sum of its proper divisors (1785072822).

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

1328557698 is a wasteful number, since it uses less digits than its factorization.

1328557698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25043 (or 25040 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The square root of 1328557698 is about 36449.3854269177. The cubic root of 1328557698 is about 1099.3267775899.

The spelling of 1328557698 in words is "one billion, three hundred twenty-eight million, five hundred fifty-seven thousand, six hundred ninety-eight".