280205425 has 12 divisors (see below), whose sum is σ = 348574540. Its totient is φ = 223441920.

The previous prime is 280205413. The next prime is 280205447. The reversal of 280205425 is 524502082.

It can be written as a sum of positive squares in 6 ways, for example, as 62583921 + 217621504 = 7911^2 + 14752^2 .

It is not a de Polignac number, because 280205425 - 2¹¹ = 280203377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 280205393 and 280205402.

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 11 ways as a sum of consecutive naturals, for example, 10080 + ... + 25729.

Almost surely, 2^280205425 is an apocalyptic number.

280205425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280205425 is a deficient number, since it is larger than the sum of its proper divisors (68369115).

280205425 is a wasteful number, since it uses less digits than its factorization.

280205425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36132 (or 36127 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 280205425 is about 16739.3376511737. The cubic root of 280205425 is about 654.3732131172.

The spelling of 280205425 in words is "two hundred eighty million, two hundred five thousand, four hundred twenty-five".