688528387 has 2 divisors, whose sum is σ = 688528388. Its totient is φ = 688528386.

The previous prime is 688528363. The next prime is 688528417. The reversal of 688528387 is 783825886.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688528387 - 2¹⁹ = 688004099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (688528307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344264193 + 344264194.

It is an arithmetic number, because the mean of its divisors is an integer number (344264194).

Almost surely, 2^688528387 is an apocalyptic number.

688528387 is a deficient number, since it is larger than the sum of its proper divisors (1).

688528387 is an equidigital number, since it uses as much as digits as its factorization.

688528387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5160960, while the sum is 55.

The square root of 688528387 is about 26239.8244468213. The cubic root of 688528387 is about 883.0269329944.

The spelling of 688528387 in words is "six hundred eighty-eight million, five hundred twenty-eight thousand, three hundred eighty-seven".