68415538 has 4 divisors (see below), whose sum is σ = 102623310. Its totient is φ = 34207768.

The previous prime is 68415521. The next prime is 68415551. The reversal of 68415538 is 83551486.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 61355889 + 7059649 = 7833^2 + 2657^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 68415538.

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 as a sum of consecutive naturals, namely, 17103883 + ... + 17103886.

Almost surely, 2^68415538 is an apocalyptic number.

68415538 is a deficient number, since it is larger than the sum of its proper divisors (34207772).

68415538 is a wasteful number, since it uses less digits than its factorization.

68415538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34207771.

The product of its digits is 115200, while the sum is 40.

The square root of 68415538 is about 8271.3685687436. The cubic root of 68415538 is about 408.9952355062.

The spelling of 68415538 in words is "sixty-eight million, four hundred fifteen thousand, five hundred thirty-eight".