68831705 has 4 divisors (see below), whose sum is σ = 82598052. Its totient is φ = 55065360.

The previous prime is 68831681. The next prime is 68831717. The reversal of 68831705 is 50713886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50713886 = 2 ⋅25356943.

It can be written as a sum of positive squares in 2 ways, for example, as 34480384 + 34351321 = 5872^2 + 5861^2 .

It is not a de Polignac number, because 68831705 - 2¹² = 68827609 is a prime.

It is a super-3 number, since 3×68831705³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6883166 + ... + 6883175.

It is an arithmetic number, because the mean of its divisors is an integer number (20649513).

Almost surely, 2^68831705 is an apocalyptic number.

It is an amenable number.

68831705 is a deficient number, since it is larger than the sum of its proper divisors (13766347).

68831705 is a wasteful number, since it uses less digits than its factorization.

68831705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13766346.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 68831705 is about 8296.4875097839. The cubic root of 68831705 is about 409.8228562528.

The spelling of 68831705 in words is "sixty-eight million, eight hundred thirty-one thousand, seven hundred five".