280505069 has 8 divisors (see below), whose sum is σ = 304855320. Its totient is φ = 256550976.

The previous prime is 280505059. The next prime is 280505089. The reversal of 280505069 is 960505082.

It can be written as a sum of positive squares in 4 ways, for example, as 3948169 + 276556900 = 1987^2 + 16630^2 .

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 280505069 - 2⁴ = 280505053 is a prime.

It is a super-2 number, since 2×280505069² = 157366187469389522, 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 (280505059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97562 + ... + 100395.

It is an arithmetic number, because the mean of its divisors is an integer number (38106915).

Almost surely, 2^280505069 is an apocalyptic number.

It is an amenable number.

280505069 is a deficient number, since it is larger than the sum of its proper divisors (24350251).

280505069 is a wasteful number, since it uses less digits than its factorization.

280505069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198079.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 280505069 is about 16748.2855540500. The cubic root of 280505069 is about 654.6063862790.

The spelling of 280505069 in words is "two hundred eighty million, five hundred five thousand, sixty-nine".