688606507 has 2 divisors, whose sum is σ = 688606508. Its totient is φ = 688606506.

The previous prime is 688606489. The next prime is 688606511. The reversal of 688606507 is 705606886.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688606507 is a prime.

It is not a weakly prime, because it can be changed into another prime (688606547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344303253 + 344303254.

It is an arithmetic number, because the mean of its divisors is an integer number (344303254).

Almost surely, 2^688606507 is an apocalyptic number.

688606507 is a deficient number, since it is larger than the sum of its proper divisors (1).

688606507 is an equidigital number, since it uses as much as digits as its factorization.

688606507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 688606507 is about 26241.3129816326. The cubic root of 688606507 is about 883.0603276259.

The spelling of 688606507 in words is "six hundred eighty-eight million, six hundred six thousand, five hundred seven".