68688437 has 2 divisors, whose sum is σ = 68688438. Its totient is φ = 68688436.

The previous prime is 68688377. The next prime is 68688463. The reversal of 68688437 is 73488686.

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., 66814276 + 1874161 = 8174^2 + 1369^2 .

It is a cyclic number.

It is not a de Polignac number, because 68688437 - 2¹⁴ = 68672053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68688497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34344218 + 34344219.

It is an arithmetic number, because the mean of its divisors is an integer number (34344219).

Almost surely, 2^68688437 is an apocalyptic number.

It is an amenable number.

68688437 is a deficient number, since it is larger than the sum of its proper divisors (1).

68688437 is an equidigital number, since it uses as much as digits as its factorization.

68688437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 50.

The square root of 68688437 is about 8287.8487558594. The cubic root of 68688437 is about 409.5383202978.

The spelling of 68688437 in words is "sixty-eight million, six hundred eighty-eight thousand, four hundred thirty-seven".