68136816 has 80 divisors (see below), whose sum is σ = 203344128. Its totient is φ = 19430400.

The previous prime is 68136797. The next prime is 68136823. The reversal of 68136816 is 61863186.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5181 + ... + 12771.

Almost surely, 2^68136816 is an apocalyptic number.

68136816 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68136816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101672064).

68136816 is an abundant number, since it is smaller than the sum of its proper divisors (135207312).

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

68136816 is a wasteful number, since it uses less digits than its factorization.

68136816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7630 (or 7624 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 68136816 is about 8254.5027712152. The cubic root of 68136816 is about 408.4390698085.

The spelling of 68136816 in words is "sixty-eight million, one hundred thirty-six thousand, eight hundred sixteen".