68009136 has 80 divisors (see below), whose sum is σ = 191925216. Its totient is φ = 20625408.

The previous prime is 68009131. The next prime is 68009171. The reversal of 68009136 is 63190086.

It is a junction number, because it is equal to n+sod(n) for n = 68009097 and 68009106.

It is not an unprimeable number, because it can be changed into a prime (68009131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44806 + ... + 46298.

Almost surely, 2^68009136 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 68009136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95962608).

68009136 is an abundant number, since it is smaller than the sum of its proper divisors (123916080).

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

68009136 is a wasteful number, since it uses less digits than its factorization.

68009136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 1584 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 68009136 is about 8246.7651839979. The cubic root of 68009136 is about 408.1837887854.

The spelling of 68009136 in words is "sixty-eight million, nine thousand, one hundred thirty-six".