1801887780 has 144 divisors (see below), whose sum is σ = 6402666816. Its totient is φ = 374411520.

The previous prime is 1801887779. The next prime is 1801887793. The reversal of 1801887780 is 877881081.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4482 + ... + 60198.

It is an arithmetic number, because the mean of its divisors is an integer number (44462964).

Almost surely, 2^1801887780 is an apocalyptic number.

1801887780 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 1801887780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3201333408).

1801887780 is an abundant number, since it is smaller than the sum of its proper divisors (4600779036).

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

1801887780 is a wasteful number, since it uses less digits than its factorization.

1801887780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55754 (or 55745 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 48.

The square root of 1801887780 is about 42448.6487417444. The cubic root of 1801887780 is about 1216.8655045847.

The spelling of 1801887780 in words is "one billion, eight hundred one million, eight hundred eighty-seven thousand, seven hundred eighty".