280864081 has 3 divisors (see below), whose sum is σ = 280880841. Its totient is φ = 280847322.

The previous prime is 280864079. The next prime is 280864117. The reversal of 280864081 is 180468082.

The square root of 280864081 is 16759.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 180468082 = 2 ⋅90234041.

It is not a de Polignac number, because 280864081 - 2¹ = 280864079 is a prime.

It is a super-2 number, since 2×280864081² = 157769263991949122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280864081.

It is not an unprimeable number, because it can be changed into a prime (280862081) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8380 + ... + 25138.

It is an arithmetic number, because the mean of its divisors is an integer number (93626947).

Almost surely, 2^280864081 is an apocalyptic number.

280864081 is the 16759-th square number.

280864081 is the 8380-th centered octagonal number.

It is an amenable number.

280864081 is a deficient number, since it is larger than the sum of its proper divisors (16760).

280864081 is an frugal number, since it uses more digits than its factorization.

280864081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33518 (or 16759 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The cubic root of 280864081 is about 654.8855391158.

The spelling of 280864081 in words is "two hundred eighty million, eight hundred sixty-four thousand, eighty-one".