1804647680 has 144 divisors (see below), whose sum is σ = 4788552384. Its totient is φ = 646103040.

The previous prime is 1804647661. The next prime is 1804647697. The reversal of 1804647680 is 867464081.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 942404 + ... + 944316.

It is an arithmetic number, because the mean of its divisors is an integer number (33253836).

Almost surely, 2^1804647680 is an apocalyptic number.

1804647680 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 1804647680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2394276192).

1804647680 is an abundant number, since it is smaller than the sum of its proper divisors (2983904704).

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

1804647680 is a wasteful number, since it uses less digits than its factorization.

1804647680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012 (or 1998 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 1804647680 is about 42481.1449939853. The cubic root of 1804647680 is about 1217.4864670242.

The spelling of 1804647680 in words is "one billion, eight hundred four million, six hundred forty-seven thousand, six hundred eighty".