68136684 has 96 divisors (see below), whose sum is σ = 203675136. Its totient is φ = 17210880.

The previous prime is 68136671. The next prime is 68136703. The reversal of 68136684 is 48663186.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33192 + ... + 35184.

It is an arithmetic number, because the mean of its divisors is an integer number (2121616).

Almost surely, 2^68136684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68136684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101837568).

68136684 is an abundant number, since it is smaller than the sum of its proper divisors (135538452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68136684 is a wasteful number, since it uses less digits than its factorization.

68136684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055 (or 2053 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 68136684 is about 8254.4947755753. The cubic root of 68136684 is about 408.4388060549.

The spelling of 68136684 in words is "sixty-eight million, one hundred thirty-six thousand, six hundred eighty-four".