280785766480 has 20 divisors (see below), whose sum is σ = 652826907252. Its totient is φ = 112314306560.

The previous prime is 280785766453. The next prime is 280785766487. The reversal of 280785766480 is 84667587082.

It can be written as a sum of positive squares in 2 ways, for example, as 156568993344 + 124216773136 = 395688^2 + 352444^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×280785766480² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280785766487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1754910961 + ... + 1754911120.

Almost surely, 2^280785766480 is an apocalyptic number.

280785766480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280785766480 is an abundant number, since it is smaller than the sum of its proper divisors (372041140772).

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

280785766480 is a wasteful number, since it uses less digits than its factorization.

280785766480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509822094 (or 3509822088 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 61.

The spelling of 280785766480 in words is "two hundred eighty billion, seven hundred eighty-five million, seven hundred sixty-six thousand, four hundred eighty".