1798021680 has 480 divisors, whose sum is σ = 7362028800. Its totient is φ = 358815744.

The previous prime is 1798021657. The next prime is 1798021783. The reversal of 1798021680 is 861208971.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2904411 + ... + 2905029.

It is an arithmetic number, because the mean of its divisors is an integer number (15337560).

Almost surely, 2^1798021680 is an apocalyptic number.

1798021680 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 1798021680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3681014400).

1798021680 is an abundant number, since it is smaller than the sum of its proper divisors (5564007120).

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

1798021680 is a wasteful number, since it uses less digits than its factorization.

1798021680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 1798021680 is about 42403.0857367716. The cubic root of 1798021680 is about 1215.9945860505.

The spelling of 1798021680 in words is "one billion, seven hundred ninety-eight million, twenty-one thousand, six hundred eighty".