68158987 has 8 divisors (see below), whose sum is σ = 75770240. Its totient is φ = 60886080.

The previous prime is 68158973. The next prime is 68159009. The reversal of 68158987 is 78985186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68158987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68158927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84162 + ... + 84967.

It is an arithmetic number, because the mean of its divisors is an integer number (9471280).

Almost surely, 2^68158987 is an apocalyptic number.

68158987 is a deficient number, since it is larger than the sum of its proper divisors (7611253).

68158987 is a wasteful number, since it uses less digits than its factorization.

68158987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169173.

The product of its digits is 967680, while the sum is 52.

The square root of 68158987 is about 8255.8456259792. The cubic root of 68158987 is about 408.4833655904.

The spelling of 68158987 in words is "sixty-eight million, one hundred fifty-eight thousand, nine hundred eighty-seven".