280766960 has 20 divisors (see below), whose sum is σ = 652783368. Its totient is φ = 112306752.

The previous prime is 280766921. The next prime is 280766963. The reversal of 280766960 is 69667082.

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

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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

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, 1754714 + ... + 1754873.

Almost surely, 2^280766960 is an apocalyptic number.

280766960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280766960 is an abundant number, since it is smaller than the sum of its proper divisors (372016408).

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

280766960 is a wasteful number, since it uses less digits than its factorization.

280766960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509600 (or 3509594 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 280766960 is about 16756.1021720447. The cubic root of 280766960 is about 654.8100453386.

Subtracting from 280766960 its reverse (69667082), we obtain a triangular number (211099878 = T₂₀₅₄₇).

The spelling of 280766960 in words is "two hundred eighty million, seven hundred sixty-six thousand, nine hundred sixty".