680654 has 16 divisors (see below), whose sum is σ = 1124928. Its totient is φ = 306912.

The previous prime is 680651. The next prime is 680657. The reversal of 680654 is 456086.

680654 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 (680651) and next prime (680657).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680654.

It is not an unprimeable number, because it can be changed into a prime (680651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 944 + ... + 1500.

It is an arithmetic number, because the mean of its divisors is an integer number (70308).

2⁶⁸⁰⁶⁵⁴ is an apocalyptic number.

680654 is a deficient number, since it is larger than the sum of its proper divisors (444274).

680654 is a wasteful number, since it uses less digits than its factorization.

680654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 680654 is about 825.0175755704. The cubic root of 680654 is about 87.9647758475.

Subtracting from 680654 its sum of digits (29), we obtain a square (680625 = 825²).

The spelling of 680654 in words is "six hundred eighty thousand, six hundred fifty-four".