68140637 has 2 divisors, whose sum is σ = 68140638. Its totient is φ = 68140636.

The previous prime is 68140619. The next prime is 68140661. The reversal of 68140637 is 73604186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64224196 + 3916441 = 8014^2 + 1979^2 .

It is a cyclic number.

It is not a de Polignac number, because 68140637 - 2⁸ = 68140381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68140597 and 68140606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68140687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34070318 + 34070319.

It is an arithmetic number, because the mean of its divisors is an integer number (34070319).

Almost surely, 2^68140637 is an apocalyptic number.

It is an amenable number.

68140637 is a deficient number, since it is larger than the sum of its proper divisors (1).

68140637 is an equidigital number, since it uses as much as digits as its factorization.

68140637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 68140637 is about 8254.7342174052. The cubic root of 68140637 is about 408.4467045284.

The spelling of 68140637 in words is "sixty-eight million, one hundred forty thousand, six hundred thirty-seven".