1780565980 has 12 divisors (see below), whose sum is σ = 3739188600. Its totient is φ = 712226384.

The previous prime is 1780565959. The next prime is 1780565987. The reversal of 1780565980 is 895650871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780565987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44514130 + ... + 44514169.

It is an arithmetic number, because the mean of its divisors is an integer number (311599050).

Almost surely, 2^1780565980 is an apocalyptic number.

1780565980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1780565980 is an abundant number, since it is smaller than the sum of its proper divisors (1958622620).

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

1780565980 is a wasteful number, since it uses less digits than its factorization.

1780565980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89028308 (or 89028306 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 49.

The square root of 1780565980 is about 42196.7531926332. The cubic root of 1780565980 is about 1212.0467102142.

The spelling of 1780565980 in words is "one billion, seven hundred eighty million, five hundred sixty-five thousand, nine hundred eighty".