680726559 has 16 divisors (see below), whose sum is σ = 915681888. Its totient is φ = 449805312.

The previous prime is 680726549. The next prime is 680726581. The reversal of 680726559 is 955627086.

It is a happy number.

It is not a de Polignac number, because 680726559 - 2²⁰ = 679677983 is a prime.

It is a super-3 number, since 3×680726559³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680726549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 524199 + ... + 525495.

It is an arithmetic number, because the mean of its divisors is an integer number (57230118).

Almost surely, 2^680726559 is an apocalyptic number.

680726559 is a deficient number, since it is larger than the sum of its proper divisors (234955329).

680726559 is a wasteful number, since it uses less digits than its factorization.

680726559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714.

The product of its (nonzero) digits is 907200, while the sum is 48.

The square root of 680726559 is about 26090.7370344343. The cubic root of 680726559 is about 879.6790147339.

The spelling of 680726559 in words is "six hundred eighty million, seven hundred twenty-six thousand, five hundred fifty-nine".