68356987 has 4 divisors (see below), whose sum is σ = 69515640. Its totient is φ = 67198336.

The previous prime is 68356931. The next prime is 68356991. The reversal of 68356987 is 78965386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78965386 = 2 ⋅39482693.

It is a cyclic number.

It is not a de Polignac number, because 68356987 - 2¹¹ = 68354939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68356997) 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, 579238 + ... + 579355.

It is an arithmetic number, because the mean of its divisors is an integer number (17378910).

Almost surely, 2^68356987 is an apocalyptic number.

68356987 is a deficient number, since it is larger than the sum of its proper divisors (1158653).

68356987 is a wasteful number, since it uses less digits than its factorization.

68356987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158652.

The product of its digits is 2177280, while the sum is 52.

The square root of 68356987 is about 8267.8284331498. The cubic root of 68356987 is about 408.8785275409.

The spelling of 68356987 in words is "sixty-eight million, three hundred fifty-six thousand, nine hundred eighty-seven".