280766880 has 72 divisors (see below), whose sum is σ = 958121892. Its totient is φ = 74870784.

The previous prime is 280766879. The next prime is 280766881. The reversal of 280766880 is 88667082.

It is an interprime number because it is at equal distance from previous prime (280766879) and next prime (280766881).

It can be written as a sum of positive squares in 2 ways, for example, as 277822224 + 2944656 = 16668^2 + 1716^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (280766881) 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 11 ways as a sum of consecutive naturals, for example, 96049 + ... + 98928.

Almost surely, 2^280766880 is an apocalyptic number.

280766880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280766880 is an abundant number, since it is smaller than the sum of its proper divisors (677355012).

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

280766880 is a wasteful number, since it uses less digits than its factorization.

280766880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194998 (or 194987 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 280766880 is about 16756.0997848545. The cubic root of 280766880 is about 654.8099831461.

The spelling of 280766880 in words is "two hundred eighty million, seven hundred sixty-six thousand, eight hundred eighty".