68911688 has 8 divisors (see below), whose sum is σ = 129209430. Its totient is φ = 34455840.

The previous prime is 68911681. The next prime is 68911697. The reversal of 68911688 is 88611986.

It can be written as a sum of positive squares in only one way, i.e., 50951044 + 17960644 = 7138^2 + 4238^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (68911681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4306973 + ... + 4306988.

Almost surely, 2^68911688 is an apocalyptic number.

It is an amenable number.

68911688 is a deficient number, since it is larger than the sum of its proper divisors (60297742).

68911688 is a wasteful number, since it uses less digits than its factorization.

68911688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8613967 (or 8613963 counting only the distinct ones).

The product of its digits is 165888, while the sum is 47.

The square root of 68911688 is about 8301.3064032115. The cubic root of 68911688 is about 409.9815339690.

The spelling of 68911688 in words is "sixty-eight million, nine hundred eleven thousand, six hundred eighty-eight".