688741 has 2 divisors, whose sum is σ = 688742. Its totient is φ = 688740.

The previous prime is 688733. The next prime is 688747. The reversal of 688741 is 147886.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390625 + 298116 = 625^2 + 546^2 .

It is a cyclic number.

It is not a de Polignac number, because 688741 - 2³ = 688733 is a prime.

It is a super-4 number, since 4×688741⁴ (a number of 24 digits) contains 4444 as substring.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 688697 and 688706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344370 + 344371.

It is an arithmetic number, because the mean of its divisors is an integer number (344371).

2⁶⁸⁸⁷⁴¹ is an apocalyptic number.

It is an amenable number.

688741 is a deficient number, since it is larger than the sum of its proper divisors (1).

688741 is an equidigital number, since it uses as much as digits as its factorization.

688741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 688741 is about 829.9042113401. The cubic root of 688741 is about 88.3117814594.

The spelling of 688741 in words is "six hundred eighty-eight thousand, seven hundred forty-one".