280926985 has 12 divisors (see below), whose sum is σ = 338981004. Its totient is φ = 223500480.

The previous prime is 280926979. The next prime is 280927013. The reversal of 280926985 is 589629082.

It can be written as a sum of positive squares in 6 ways, for example, as 213949129 + 66977856 = 14627^2 + 8184^2 .

It is not a de Polignac number, because 280926985 - 2⁵ = 280926953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 667075 + ... + 667495.

It is an arithmetic number, because the mean of its divisors is an integer number (28248417).

Almost surely, 2^280926985 is an apocalyptic number.

It is an amenable number.

280926985 is a deficient number, since it is larger than the sum of its proper divisors (58054019).

280926985 is an frugal number, since it uses more digits than its factorization.

280926985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164 (or 743 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 280926985 is about 16760.8766178861. The cubic root of 280926985 is about 654.9344261608.

The spelling of 280926985 in words is "two hundred eighty million, nine hundred twenty-six thousand, nine hundred eighty-five".