280525 has 18 divisors (see below), whose sum is σ = 406410. Its totient is φ = 191520.

The previous prime is 280513. The next prime is 280537. The reversal of 280525 is 525082.

280525 = 49² + 50² + ... + 98².

It is an interprime number because it is at equal distance from previous prime (280513) and next prime (280537).

It can be written as a sum of positive squares in 3 ways, for example, as 67081 + 213444 = 259^2 + 462^2 .

It is not a de Polignac number, because 280525 - 2⁹ = 280013 is a prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 280496 and 280505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1111 + ... + 1339.

2²⁸⁰⁵²⁵ is an apocalyptic number.

280525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280525 is a deficient number, since it is larger than the sum of its proper divisors (125885).

280525 is a wasteful number, since it uses less digits than its factorization.

280525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 280525 is about 529.6461082648. The cubic root of 280525 is about 65.4621890040.

It can be divided in two parts, 2805 and 25, that multiplied together give a triangular number (70125 = T₃₇₄).

The spelling of 280525 in words is "two hundred eighty thousand, five hundred twenty-five".