68138636 has 12 divisors (see below), whose sum is σ = 125518680. Its totient is φ = 32276160.

The previous prime is 68138633. The next prime is 68138641. The reversal of 68138636 is 63683186.

It is a junction number, because it is equal to n+sod(n) for n = 68138593 and 68138602.

It is not an unprimeable number, because it can be changed into a prime (68138633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448205 + ... + 448356.

It is an arithmetic number, because the mean of its divisors is an integer number (10459890).

Almost surely, 2^68138636 is an apocalyptic number.

It is an amenable number.

68138636 is a deficient number, since it is larger than the sum of its proper divisors (57380044).

68138636 is a wasteful number, since it uses less digits than its factorization.

68138636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896584 (or 896582 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The square root of 68138636 is about 8254.6130133399. The cubic root of 68138636 is about 408.4427063765.

The spelling of 68138636 in words is "sixty-eight million, one hundred thirty-eight thousand, six hundred thirty-six".