280500065 has 24 divisors (see below), whose sum is σ = 360258624. Its totient is φ = 209264000.

The previous prime is 280500061. The next prime is 280500083. The reversal of 280500065 is 560005082.

It is not a de Polignac number, because 280500065 - 2² = 280500061 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280500061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192590 + ... + 194040.

It is an arithmetic number, because the mean of its divisors is an integer number (15010776).

Almost surely, 2^280500065 is an apocalyptic number.

It is an amenable number.

280500065 is a deficient number, since it is larger than the sum of its proper divisors (79758559).

280500065 is a wasteful number, since it uses less digits than its factorization.

280500065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561 (or 1520 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 280500065 is about 16748.1361649588. The cubic root of 280500065 is about 654.6024936936.

The spelling of 280500065 in words is "two hundred eighty million, five hundred thousand, sixty-five".