68005057 has 4 divisors (see below), whose sum is σ = 69119956. Its totient is φ = 66890160.

The previous prime is 68005039. The next prime is 68005073. The reversal of 68005057 is 75050086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 781456 + 67223601 = 884^2 + 8199^2 .

It is not a de Polignac number, because 68005057 - 2⁷ = 68004929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (62005057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557358 + ... + 557479.

It is an arithmetic number, because the mean of its divisors is an integer number (17279989).

Almost surely, 2^68005057 is an apocalyptic number.

It is an amenable number.

68005057 is a deficient number, since it is larger than the sum of its proper divisors (1114899).

68005057 is a wasteful number, since it uses less digits than its factorization.

68005057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114898.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 68005057 is about 8246.5178711987. The cubic root of 68005057 is about 408.1756280438.

The spelling of 68005057 in words is "sixty-eight million, five thousand, fifty-seven".