680535 has 24 divisors (see below), whose sum is σ = 1227120. Its totient is φ = 357840.

The previous prime is 680531. The next prime is 680539. The reversal of 680535 is 535086.

680535 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (680531) and next prime (680539).

It is not a de Polignac number, because 680535 - 2² = 680531 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 680499 and 680508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680531) 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, 9550 + ... + 9620.

It is an arithmetic number, because the mean of its divisors is an integer number (51130).

2⁶⁸⁰⁵³⁵ is an apocalyptic number.

680535 is a deficient number, since it is larger than the sum of its proper divisors (546585).

680535 is an equidigital number, since it uses as much as digits as its factorization.

680535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 680535 is about 824.9454527422. The cubic root of 680535 is about 87.9596492004.

The spelling of 680535 in words is "six hundred eighty thousand, five hundred thirty-five".