1998724728 has 256 divisors, whose sum is σ = 6755696640. Its totient is φ = 475891200.

The previous prime is 1998724669. The next prime is 1998724733. The reversal of 1998724728 is 8274278991.

1998724728 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6510351 + ... + 6510657.

It is an arithmetic number, because the mean of its divisors is an integer number (26389440).

Almost surely, 2^1998724728 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 1998724728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3377848320).

1998724728 is an abundant number, since it is smaller than the sum of its proper divisors (4756971912).

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

1998724728 is a wasteful number, since it uses less digits than its factorization.

1998724728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 614 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 57.

The square root of 1998724728 is about 44707.0993020124. The cubic root of 1998724728 is about 1259.6532026176.

The spelling of 1998724728 in words is "one billion, nine hundred ninety-eight million, seven hundred twenty-four thousand, seven hundred twenty-eight".