68933987 has 4 divisors (see below), whose sum is σ = 71157696. Its totient is φ = 66710280.

The previous prime is 68933981. The next prime is 68933993. The reversal of 68933987 is 78933986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78933986 = 2 ⋅39466993.

It is an interprime number because it is at equal distance from previous prime (68933981) and next prime (68933993).

It is a cyclic number.

It is not a de Polignac number, because 68933987 - 2⁸ = 68933731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68933981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111808 + ... + 1111869.

It is an arithmetic number, because the mean of its divisors is an integer number (17789424).

Almost surely, 2^68933987 is an apocalyptic number.

68933987 is a deficient number, since it is larger than the sum of its proper divisors (2223709).

68933987 is a wasteful number, since it uses less digits than its factorization.

68933987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223708.

The product of its digits is 1959552, while the sum is 53.

The square root of 68933987 is about 8302.6493964276. The cubic root of 68933987 is about 410.0257509109.

Subtracting 68933987 from its reverse (78933986), we obtain a palindrome (9999999).

The spelling of 68933987 in words is "sixty-eight million, nine hundred thirty-three thousand, nine hundred eighty-seven".