280005087 has 4 divisors (see below), whose sum is σ = 373340120. Its totient is φ = 186670056.

The previous prime is 280005083. The next prime is 280005097. The reversal of 280005087 is 780500082.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 280005087 - 2² = 280005083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280005083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46667512 + ... + 46667517.

It is an arithmetic number, because the mean of its divisors is an integer number (93335030).

Almost surely, 2^280005087 is an apocalyptic number.

280005087 is a deficient number, since it is larger than the sum of its proper divisors (93335033).

280005087 is an equidigital number, since it uses as much as digits as its factorization.

280005087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93335032.

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

The square root of 280005087 is about 16733.3525331895. The cubic root of 280005087 is about 654.2172238981.

The spelling of 280005087 in words is "two hundred eighty million, five thousand, eighty-seven".