280625 has 10 divisors (see below), whose sum is σ = 351450. Its totient is φ = 224000.

The previous prime is 280613. The next prime is 280627. The reversal of 280625 is 526082.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 94864 + 185761 = 308^2 + 431^2 .

It is not a de Polignac number, because 280625 - 2⁶ = 280561 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 280625.

It is not an unprimeable number, because it can be changed into a prime (280627) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 401 + ... + 849.

It is an arithmetic number, because the mean of its divisors is an integer number (35145).

2²⁸⁰⁶²⁵ is an apocalyptic number.

280625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280625 is a deficient number, since it is larger than the sum of its proper divisors (70825).

280625 is an frugal number, since it uses more digits than its factorization.

280625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 280625 is about 529.7405025104. The cubic root of 280625 is about 65.4699666129.

The spelling of 280625 in words is "two hundred eighty thousand, six hundred twenty-five".