1998766080 has 180 divisors, whose sum is σ = 6931400112. Its totient is φ = 532807680.

The previous prime is 1998766067. The next prime is 1998766087. The reversal of 1998766080 is 806678991.

It is a tau number, because it is divible by the number of its divisors (180).

It is not an unprimeable number, because it can be changed into a prime (1998766087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 735925 + ... + 738635.

Almost surely, 2^1998766080 is an apocalyptic number.

1998766080 is a gapful number since it is divisible by the number (10) 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 1998766080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3465700056).

1998766080 is an abundant number, since it is smaller than the sum of its proper divisors (4932634032).

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

1998766080 is an equidigital number, since it uses as much as digits as its factorization.

1998766080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750 (or 2721 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 1998766080 is about 44707.5617765049. The cubic root of 1998766080 is about 1259.6618896267.

The spelling of 1998766080 in words is "one billion, nine hundred ninety-eight million, seven hundred sixty-six thousand, eighty".