68138512 has 40 divisors (see below), whose sum is σ = 148365504. Its totient is φ = 30079104.

The previous prime is 68138509. The next prime is 68138561. The reversal of 68138512 is 21583186.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2338 + ... + 11905.

Almost surely, 2^68138512 is an apocalyptic number.

It is an amenable number.

68138512 is an abundant number, since it is smaller than the sum of its proper divisors (80226992).

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

68138512 is a wasteful number, since it uses less digits than its factorization.

68138512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14287 (or 14281 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 68138512 is about 8254.6055023847. The cubic root of 68138512 is about 408.4424586124.

It can be divided in two parts, 681 and 38512, that added together give a palindrome (39193).

The spelling of 68138512 in words is "sixty-eight million, one hundred thirty-eight thousand, five hundred twelve".