68728831 has 2 divisors, whose sum is σ = 68728832. Its totient is φ = 68728830.

The previous prime is 68728813. The next prime is 68728837. The reversal of 68728831 is 13882786.

It is a happy number.

Together with previous prime (68728813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68728831 - 2⁵ = 68728799 is a prime.

It is a super-2 number, since 2×68728831² = 9447304421253122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68728837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34364415 + 34364416.

It is an arithmetic number, because the mean of its divisors is an integer number (34364416).

Almost surely, 2^68728831 is an apocalyptic number.

68728831 is a deficient number, since it is larger than the sum of its proper divisors (1).

68728831 is an equidigital number, since it uses as much as digits as its factorization.

68728831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 68728831 is about 8290.2853388771. The cubic root of 68728831 is about 409.6185844095.

The spelling of 68728831 in words is "sixty-eight million, seven hundred twenty-eight thousand, eight hundred thirty-one".