68638357 has 2 divisors, whose sum is σ = 68638358. Its totient is φ = 68638356.

The previous prime is 68638337. The next prime is 68638373. The reversal of 68638357 is 75383686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67469796 + 1168561 = 8214^2 + 1081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68638357 is a prime.

It is a super-2 number, since 2×68638357² = 9422448103318898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68638307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34319178 + 34319179.

It is an arithmetic number, because the mean of its divisors is an integer number (34319179).

Almost surely, 2^68638357 is an apocalyptic number.

It is an amenable number.

68638357 is a deficient number, since it is larger than the sum of its proper divisors (1).

68638357 is an equidigital number, since it uses as much as digits as its factorization.

68638357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The square root of 68638357 is about 8284.8269143055. The cubic root of 68638357 is about 409.4387661057.

The spelling of 68638357 in words is "sixty-eight million, six hundred thirty-eight thousand, three hundred fifty-seven".