688698089 has 2 divisors, whose sum is σ = 688698090. Its totient is φ = 688698088.

The previous prime is 688698071. The next prime is 688698107. The reversal of 688698089 is 980896886.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (688698071) and next prime (688698107).

It can be written as a sum of positive squares in only one way, i.e., 367105600 + 321592489 = 19160^2 + 17933^2 .

It is a cyclic number.

It is not a de Polignac number, because 688698089 - 2²⁰ = 687649513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (688698389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344349044 + 344349045.

It is an arithmetic number, because the mean of its divisors is an integer number (344349045).

Almost surely, 2^688698089 is an apocalyptic number.

It is an amenable number.

688698089 is a deficient number, since it is larger than the sum of its proper divisors (1).

688698089 is an equidigital number, since it uses as much as digits as its factorization.

688698089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11943936, while the sum is 62.

The square root of 688698089 is about 26243.0579201434. The cubic root of 688698089 is about 883.0994737590.

The spelling of 688698089 in words is "six hundred eighty-eight million, six hundred ninety-eight thousand, eighty-nine".