280000825 has 12 divisors (see below), whose sum is σ = 373909228. Its totient is φ = 206769600.

The previous prime is 280000823. The next prime is 280000859. The reversal of 280000825 is 528000082.

It can be written as a sum of positive squares in 6 ways, for example, as 12482089 + 267518736 = 3533^2 + 16356^2 .

It is not a de Polignac number, because 280000825 - 2¹ = 280000823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 280000825.

It is not an unprimeable number, because it can be changed into a prime (280000823) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 430446 + ... + 431095.

Almost surely, 2^280000825 is an apocalyptic number.

280000825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280000825 is a deficient number, since it is larger than the sum of its proper divisors (93908403).

280000825 is a wasteful number, since it uses less digits than its factorization.

280000825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861564 (or 861559 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 280000825 is about 16733.2251822534. The cubic root of 280000825 is about 654.2139045680.

The spelling of 280000825 in words is "two hundred eighty million, eight hundred twenty-five", and thus it is an aban number.