280085005 has 8 divisors (see below), whose sum is σ = 345186072. Its totient is φ = 218011968.

The previous prime is 280084999. The next prime is 280085009. The reversal of 280085005 is 500580082.

It can be written as a sum of positive squares in 4 ways, for example, as 123609924 + 156475081 = 11118^2 + 12509^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 280085005 - 2¹³ = 280076813 is a prime.

It is a super-2 number, since 2×280085005² = 156895220051700050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280085009) 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 7 ways as a sum of consecutive naturals, for example, 756802 + ... + 757171.

It is an arithmetic number, because the mean of its divisors is an integer number (43148259).

Almost surely, 2^280085005 is an apocalyptic number.

It is an amenable number.

280085005 is a deficient number, since it is larger than the sum of its proper divisors (65101067).

280085005 is a wasteful number, since it uses less digits than its factorization.

280085005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514015.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 280085005 is about 16735.7403481292. The cubic root of 280085005 is about 654.2794593849.

The spelling of 280085005 in words is "two hundred eighty million, eighty-five thousand, five".