688716433 has 2 divisors, whose sum is σ = 688716434. Its totient is φ = 688716432.

The previous prime is 688716407. The next prime is 688716451. The reversal of 688716433 is 334617886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 551639169 + 137077264 = 23487^2 + 11708^2 .

It is a cyclic number.

It is not a de Polignac number, because 688716433 - 2²¹ = 686619281 is a prime.

It is not a weakly prime, because it can be changed into another prime (688716463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344358216 + 344358217.

It is an arithmetic number, because the mean of its divisors is an integer number (344358217).

Almost surely, 2^688716433 is an apocalyptic number.

It is an amenable number.

688716433 is a deficient number, since it is larger than the sum of its proper divisors (1).

688716433 is an equidigital number, since it uses as much as digits as its factorization.

688716433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 46.

The square root of 688716433 is about 26243.4074197693. The cubic root of 688716433 is about 883.1073143659.

The spelling of 688716433 in words is "six hundred eighty-eight million, seven hundred sixteen thousand, four hundred thirty-three".