678535 has 24 divisors (see below), whose sum is σ = 975024. Its totient is φ = 449280.

The previous prime is 678533. The next prime is 678541. The reversal of 678535 is 535876.

It is a happy number.

678535 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 678535 - 2¹ = 678533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 678535.

It is a congruent number.

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

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9259 + ... + 9331.

It is an arithmetic number, because the mean of its divisors is an integer number (40626).

2⁶⁷⁸⁵³⁵ is an apocalyptic number.

678535 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

678535 is a deficient number, since it is larger than the sum of its proper divisors (296489).

678535 is a wasteful number, since it uses less digits than its factorization.

678535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 102 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 678535 is about 823.7323594469. The cubic root of 678535 is about 87.8733974942.

The spelling of 678535 in words is "six hundred seventy-eight thousand, five hundred thirty-five".