678530 has 8 divisors (see below), whose sum is σ = 1221372. Its totient is φ = 271408.

The previous prime is 678499. The next prime is 678533. The reversal of 678530 is 35876.

It can be written as a sum of positive squares in 2 ways, for example, as 674041 + 4489 = 821^2 + 67^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 678493 and 678502.

It is not an unprimeable number, because it can be changed into a prime (678533) by changing a digit.

678530 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 3 ways as a sum of consecutive naturals, for example, 33917 + ... + 33936.

2⁶⁷⁸⁵³⁰ is an apocalyptic number.

678530 is a deficient number, since it is larger than the sum of its proper divisors (542842).

678530 is a wasteful number, since it uses less digits than its factorization.

678530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67860.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 678530 is about 823.7293244750. The cubic root of 678530 is about 87.8731816527.

The spelling of 678530 in words is "six hundred seventy-eight thousand, five hundred thirty".