684025 has 6 divisors (see below), whose sum is σ = 848222. Its totient is φ = 547200.

The previous prime is 684017. The next prime is 684037. The reversal of 684025 is 520486.

It can be written as a sum of positive squares in 3 ways, for example, as 61504 + 622521 = 248^2 + 789^2 .

It is not a de Polignac number, because 684025 - 2³ = 684017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 27361 = 684025 / (6 + 8 + 4 + 0 + 2 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13656 + ... + 13705.

2⁶⁸⁴⁰²⁵ is an apocalyptic number.

It is an amenable number.

684025 is a deficient number, since it is larger than the sum of its proper divisors (164197).

684025 is a wasteful number, since it uses less digits than its factorization.

684025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27371 (or 27366 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 684025 is about 827.0580390759. The cubic root of 684025 is about 88.1097545849.

The spelling of 684025 in words is "six hundred eighty-four thousand, twenty-five".