689584729 has 2 divisors, whose sum is σ = 689584730. Its totient is φ = 689584728.

The previous prime is 689584717. The next prime is 689584741. The reversal of 689584729 is 927485986.

It is a balanced prime because it is at equal distance from previous prime (689584717) and next prime (689584741).

It can be written as a sum of positive squares in only one way, i.e., 624750025 + 64834704 = 24995^2 + 8052^2 .

It is a cyclic number.

It is not a de Polignac number, because 689584729 - 2⁵ = 689584697 is a prime.

It is not a weakly prime, because it can be changed into another prime (689584769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344792364 + 344792365.

It is an arithmetic number, because the mean of its divisors is an integer number (344792365).

Almost surely, 2^689584729 is an apocalyptic number.

It is an amenable number.

689584729 is a deficient number, since it is larger than the sum of its proper divisors (1).

689584729 is an equidigital number, since it uses as much as digits as its factorization.

689584729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 58.

The square root of 689584729 is about 26259.9453350535. The cubic root of 689584729 is about 883.4782829734.

It can be divided in two parts, 6895847 and 29, that added together give a square (6895876 = 2626²).

The spelling of 689584729 in words is "six hundred eighty-nine million, five hundred eighty-four thousand, seven hundred twenty-nine".