680726529 has 24 divisors (see below), whose sum is σ = 1189843200. Its totient is φ = 366104448.

The previous prime is 680726513. The next prime is 680726537. The reversal of 680726529 is 925627086.

It is not a de Polignac number, because 680726529 - 2⁴ = 680726513 is a prime.

It is a Curzon 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 23 ways as a sum of consecutive naturals, for example, 316729 + ... + 318870.

It is an arithmetic number, because the mean of its divisors is an integer number (49576800).

Almost surely, 2^680726529 is an apocalyptic number.

It is an amenable number.

680726529 is a deficient number, since it is larger than the sum of its proper divisors (509116671).

680726529 is a wasteful number, since it uses less digits than its factorization.

680726529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635629 (or 635626 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 680726529 is about 26090.7364595176. The cubic root of 680726529 is about 879.6790018113.

The spelling of 680726529 in words is "six hundred eighty million, seven hundred twenty-six thousand, five hundred twenty-nine".