280766961 has 12 divisors (see below), whose sum is σ = 407613492. Its totient is φ = 186226656.

The previous prime is 280766921. The next prime is 280766963. The reversal of 280766961 is 169667082.

It can be written as a sum of positive squares in 2 ways, for example, as 262440000 + 18326961 = 16200^2 + 4281^2 .

It is not a de Polignac number, because 280766961 - 2⁹ = 280766449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280766963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77406 + ... + 80951.

It is an arithmetic number, because the mean of its divisors is an integer number (33967791).

Almost surely, 2^280766961 is an apocalyptic number.

It is an amenable number.

280766961 is a deficient number, since it is larger than the sum of its proper divisors (126846531).

280766961 is a wasteful number, since it uses less digits than its factorization.

280766961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158560 (or 158557 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 280766961 is about 16756.1022018845. The cubic root of 280766961 is about 654.8100461160.

The spelling of 280766961 in words is "two hundred eighty million, seven hundred sixty-six thousand, nine hundred sixty-one".