1998700354728 has 512 divisors, whose sum is σ = 7299072000000. Its totient is φ = 490952067840.

The previous prime is 1998700354711. The next prime is 1998700354753. The reversal of 1998700354728 is 8274530078991.

1998700354728 is a `hidden beast` number, since 1 + 9 + 9 + 87 + 0 + 0 + 3 + 547 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 189283513 + ... + 189294071.

It is an arithmetic number, because the mean of its divisors is an integer number (14256000000).

Almost surely, 2^{1998700354728} is an apocalyptic number.

1998700354728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998700354728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3649536000000).

1998700354728 is an abundant number, since it is smaller than the sum of its proper divisors (5300371645272).

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

1998700354728 is a wasteful number, since it uses less digits than its factorization.

1998700354728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11210 (or 11200 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 63.

The spelling of 1998700354728 in words is "one trillion, nine hundred ninety-eight billion, seven hundred million, three hundred fifty-four thousand, seven hundred twenty-eight".