68142887 has 4 divisors (see below), whose sum is σ = 68179800. Its totient is φ = 68105976.

The previous prime is 68142883. The next prime is 68142901. The reversal of 68142887 is 78824186.

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

It is a cyclic number.

It is not a de Polignac number, because 68142887 - 2² = 68142883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68142881) 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, 15533 + ... + 19430.

It is an arithmetic number, because the mean of its divisors is an integer number (17044950).

Almost surely, 2^68142887 is an apocalyptic number.

68142887 is a deficient number, since it is larger than the sum of its proper divisors (36913).

68142887 is a wasteful number, since it uses less digits than its factorization.

68142887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36912.

The product of its digits is 172032, while the sum is 44.

The square root of 68142887 is about 8254.8705017099. The cubic root of 68142887 is about 408.4512001080.

The spelling of 68142887 in words is "sixty-eight million, one hundred forty-two thousand, eight hundred eighty-seven".