280780005 has 32 divisors (see below), whose sum is σ = 515888640. Its totient is φ = 128969280.

The previous prime is 280779991. The next prime is 280780033. The reversal of 280780005 is 500087082.

It is not a de Polignac number, because 280780005 - 2¹⁵ = 280747237 is a prime.

It is a super-2 number, since 2×280780005² = 157674822415600050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41647 + ... + 47916.

It is an arithmetic number, because the mean of its divisors is an integer number (16121520).

Almost surely, 2^280780005 is an apocalyptic number.

It is an amenable number.

280780005 is a deficient number, since it is larger than the sum of its proper divisors (235108635).

280780005 is a wasteful number, since it uses less digits than its factorization.

280780005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89601.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 280780005 is about 16756.4914286971. The cubic root of 280780005 is about 654.8201864473.

The spelling of 280780005 in words is "two hundred eighty million, seven hundred eighty thousand, five".