684554 has 16 divisors (see below), whose sum is σ = 1120392. Its totient is φ = 311808.

The previous prime is 684547. The next prime is 684557. The reversal of 684554 is 455486.

It can be written as a sum of positive squares in 4 ways, for example, as 156025 + 528529 = 395^2 + 727^2 .

It is a super-2 number, since 2×684554² = 937228357832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 684554.

It is not an unprimeable number, because it can be changed into a prime (684557) by changing a digit.

684554 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2822 + ... + 3054.

2⁶⁸⁴⁵⁵⁴ is an apocalyptic number.

684554 is a deficient number, since it is larger than the sum of its proper divisors (435838).

684554 is a wasteful number, since it uses less digits than its factorization.

684554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361.

The product of its digits is 19200, while the sum is 32.

The square root of 684554 is about 827.3777855369. The cubic root of 684554 is about 88.1324623562.

The spelling of 684554 in words is "six hundred eighty-four thousand, five hundred fifty-four".