68109757 has 4 divisors (see below), whose sum is σ = 68486236. Its totient is φ = 67733280.

The previous prime is 68109749. The next prime is 68109763. The reversal of 68109757 is 75790186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75790186 = 2 ⋅37895093.

It can be written as a sum of positive squares in 2 ways, for example, as 14907321 + 53202436 = 3861^2 + 7294^2 .

It is a cyclic number.

It is not a de Polignac number, because 68109757 - 2³ = 68109749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68109787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187968 + ... + 188329.

It is an arithmetic number, because the mean of its divisors is an integer number (17121559).

Almost surely, 2^68109757 is an apocalyptic number.

It is an amenable number.

68109757 is a deficient number, since it is larger than the sum of its proper divisors (376479).

68109757 is a wasteful number, since it uses less digits than its factorization.

68109757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376478.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 68109757 is about 8252.8635636366. The cubic root of 68109757 is about 408.3849951943.

The spelling of 68109757 in words is "sixty-eight million, one hundred nine thousand, seven hundred fifty-seven".