280725 has 24 divisors (see below), whose sum is σ = 491040. Its totient is φ = 141120.

The previous prime is 280717. The next prime is 280729. The reversal of 280725 is 527082.

It is not a de Polignac number, because 280725 - 2³ = 280717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 280695 and 280704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1327 + ... + 1523.

It is an arithmetic number, because the mean of its divisors is an integer number (20460).

2²⁸⁰⁷²⁵ is an apocalyptic number.

280725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280725 is a deficient number, since it is larger than the sum of its proper divisors (210315).

280725 is a wasteful number, since it uses less digits than its factorization.

280725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 280725 is about 529.8348799390. The cubic root of 280725 is about 65.4777423743.

The spelling of 280725 in words is "two hundred eighty thousand, seven hundred twenty-five".