68308857 has 24 divisors (see below), whose sum is σ = 104482560. Its totient is φ = 42884640.

The previous prime is 68308853. The next prime is 68308859. The reversal of 68308857 is 75880386.

It is not a de Polignac number, because 68308857 - 2² = 68308853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68308853) 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 in 23 ways as a sum of consecutive naturals, for example, 29848 + ... + 32054.

It is an arithmetic number, because the mean of its divisors is an integer number (4353440).

Almost surely, 2^68308857 is an apocalyptic number.

It is an amenable number.

68308857 is a deficient number, since it is larger than the sum of its proper divisors (36173703).

68308857 is a wasteful number, since it uses less digits than its factorization.

68308857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413 (or 2410 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 68308857 is about 8264.9172409650. The cubic root of 68308857 is about 408.7825415273.

The spelling of 68308857 in words is "sixty-eight million, three hundred eight thousand, eight hundred fifty-seven".