280025 has 12 divisors (see below), whose sum is σ = 363072. Its totient is φ = 213840.

The previous prime is 280013. The next prime is 280031. The reversal of 280025 is 520082.

280025 = T₁₃₇ + T₁₃₈ + ... + T₁₆₁.

It is a happy number.

It is not a de Polignac number, because 280025 - 2⁴ = 280009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 279985 and 280012.

It is a congruent 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, 332 + ... + 818.

It is an arithmetic number, because the mean of its divisors is an integer number (30256).

2²⁸⁰⁰²⁵ is an apocalyptic number.

280025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280025 is a deficient number, since it is larger than the sum of its proper divisors (83047).

280025 is a wasteful number, since it uses less digits than its factorization.

280025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 280025 is about 529.1738844652. The cubic root of 280025 is about 65.4232732091.

The spelling of 280025 in words is "two hundred eighty thousand, twenty-five".