280888945 has 8 divisors (see below), whose sum is σ = 338131944. Its totient is φ = 224001024.

The previous prime is 280888939. The next prime is 280888961. The reversal of 280888945 is 549888082.

It can be written as a sum of positive squares in 4 ways, for example, as 1062961 + 279825984 = 1031^2 + 16728^2 .

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 280888945 - 2¹¹ = 280886897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 280888892 and 280888901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87024 + ... + 90193.

It is an arithmetic number, because the mean of its divisors is an integer number (42266493).

Almost surely, 2^280888945 is an apocalyptic number.

It is an amenable number.

280888945 is a deficient number, since it is larger than the sum of its proper divisors (57242999).

280888945 is a wasteful number, since it uses less digits than its factorization.

280888945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177539.

The product of its (nonzero) digits is 1474560, while the sum is 52.

The square root of 280888945 is about 16759.7417939537. The cubic root of 280888945 is about 654.9048635206.

The spelling of 280888945 in words is "two hundred eighty million, eight hundred eighty-eight thousand, nine hundred forty-five".