689600069 has 2 divisors, whose sum is σ = 689600070. Its totient is φ = 689600068.

The previous prime is 689600057. The next prime is 689600137. The reversal of 689600069 is 960006986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481144225 + 208455844 = 21935^2 + 14438^2 .

It is a cyclic number.

It is not a de Polignac number, because 689600069 - 2¹⁶ = 689534533 is a prime.

It is a super-2 number, since 2×689600069² = 951096510329609522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689600029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344800034 + 344800035.

It is an arithmetic number, because the mean of its divisors is an integer number (344800035).

Almost surely, 2^689600069 is an apocalyptic number.

It is an amenable number.

689600069 is a deficient number, since it is larger than the sum of its proper divisors (1).

689600069 is an equidigital number, since it uses as much as digits as its factorization.

689600069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 689600069 is about 26260.2374132451. The cubic root of 689600069 is about 883.4848339964.

The spelling of 689600069 in words is "six hundred eighty-nine million, six hundred thousand, sixty-nine".