1098998784 has 132 divisors (see below), whose sum is σ = 3417810396. Its totient is φ = 338116608.

The previous prime is 1098998759. The next prime is 1098998821. The reversal of 1098998784 is 4878998901.

It can be written as a sum of positive squares in 2 ways, for example, as 83174400 + 1015824384 = 9120^2 + 31872^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115222 + ... + 124394.

It is an arithmetic number, because the mean of its divisors is an integer number (25892503).

Almost surely, 2^1098998784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1098998784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1708905198).

1098998784 is an abundant number, since it is smaller than the sum of its proper divisors (2318811612).

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

1098998784 is a wasteful number, since it uses less digits than its factorization.

1098998784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9212 (or 9191 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The square root of 1098998784 is about 33151.1505682684. The cubic root of 1098998784 is about 1031.9668278503.

The spelling of 1098998784 in words is "one billion, ninety-eight million, nine hundred ninety-eight thousand, seven hundred eighty-four".