68157705 has 32 divisors (see below), whose sum is σ = 135963648. Its totient is φ = 28324800.

The previous prime is 68157701. The next prime is 68157721. The reversal of 68157705 is 50775186.

It is not a de Polignac number, because 68157705 - 2² = 68157701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68157701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28351 + ... + 30660.

It is an arithmetic number, because the mean of its divisors is an integer number (4248864).

Almost surely, 2^68157705 is an apocalyptic number.

It is an amenable number.

68157705 is a deficient number, since it is larger than the sum of its proper divisors (67805943).

68157705 is a wasteful number, since it uses less digits than its factorization.

68157705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59037.

The product of its (nonzero) digits is 58800, while the sum is 39.

The square root of 68157705 is about 8255.7679836585. The cubic root of 68157705 is about 408.4808045245.

The spelling of 68157705 in words is "sixty-eight million, one hundred fifty-seven thousand, seven hundred five".