280040085 has 40 divisors (see below), whose sum is σ = 540623160. Its totient is φ = 137863296.

The previous prime is 280040077. The next prime is 280040113. The reversal of 280040085 is 580040082.

It can be written as a sum of positive squares in 4 ways, for example, as 51969681 + 228070404 = 7209^2 + 15102^2 .

It is not a de Polignac number, because 280040085 - 2³ = 280040077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 21330 + ... + 31859.

It is an arithmetic number, because the mean of its divisors is an integer number (13515579).

Almost surely, 2^280040085 is an apocalyptic number.

It is an amenable number.

280040085 is a deficient number, since it is larger than the sum of its proper divisors (260583075).

280040085 is a wasteful number, since it uses less digits than its factorization.

280040085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53219 (or 53210 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 280040085 is about 16734.3982562864. The cubic root of 280040085 is about 654.2444797607.

The spelling of 280040085 in words is "two hundred eighty million, forty thousand, eighty-five".