1781130880 has 32 divisors (see below), whose sum is σ = 4258017540. Its totient is φ = 712452096.

The previous prime is 1781130863. The next prime is 1781130913. The reversal of 1781130880 is 880311871.

It can be written as a sum of positive squares in 2 ways, for example, as 1673137216 + 107993664 = 40904^2 + 10392^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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 3 ways as a sum of consecutive naturals, for example, 1390869 + ... + 1392148.

Almost surely, 2^1781130880 is an apocalyptic number.

1781130880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1781130880 is an abundant number, since it is smaller than the sum of its proper divisors (2476886660).

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

1781130880 is an equidigital number, since it uses as much as digits as its factorization.

1781130880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783036 (or 2783024 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 37.

The square root of 1781130880 is about 42203.4463047747. The cubic root of 1781130880 is about 1212.1748741051.

The spelling of 1781130880 in words is "one billion, seven hundred eighty-one million, one hundred thirty thousand, eight hundred eighty".