280480385 has 16 divisors (see below), whose sum is σ = 348682320. Its totient is φ = 216437760.

The previous prime is 280480367. The next prime is 280480397. The reversal of 280480385 is 583084082.

It can be written as a sum of positive squares in 8 ways, for example, as 157979761 + 122500624 = 12569^2 + 11068^2 .

It is not a de Polignac number, because 280480385 - 2¹⁰ = 280479361 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10559 + ... + 25931.

It is an arithmetic number, because the mean of its divisors is an integer number (21792645).

Almost surely, 2^280480385 is an apocalyptic number.

It is an amenable number.

280480385 is a deficient number, since it is larger than the sum of its proper divisors (68201935).

280480385 is a wasteful number, since it uses less digits than its factorization.

280480385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15508.

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 280480385 is about 16747.5486265901. The cubic root of 280480385 is about 654.5871842754.

The spelling of 280480385 in words is "two hundred eighty million, four hundred eighty thousand, three hundred eighty-five".