68436538 has 4 divisors (see below), whose sum is σ = 102654810. Its totient is φ = 34218268.

The previous prime is 68436517. The next prime is 68436553. The reversal of 68436538 is 83563486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83563486 = 2 ⋅41781743.

It can be written as a sum of positive squares in only one way, i.e., 54125449 + 14311089 = 7357^2 + 3783^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68436494 and 68436503.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17109133 + ... + 17109136.

Almost surely, 2^68436538 is an apocalyptic number.

68436538 is a deficient number, since it is larger than the sum of its proper divisors (34218272).

68436538 is a wasteful number, since it uses less digits than its factorization.

68436538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34218271.

The product of its digits is 414720, while the sum is 43.

The square root of 68436538 is about 8272.6379106063. The cubic root of 68436538 is about 409.0370779569.

The spelling of 68436538 in words is "sixty-eight million, four hundred thirty-six thousand, five hundred thirty-eight".