68142889 has 4 divisors (see below), whose sum is σ = 69102720. Its totient is φ = 67183060.

The previous prime is 68142883. The next prime is 68142901. The reversal of 68142889 is 98824186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68142889 - 2³ = 68142881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68142881) 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, 479809 + ... + 479950.

It is an arithmetic number, because the mean of its divisors is an integer number (17275680).

Almost surely, 2^68142889 is an apocalyptic number.

It is an amenable number.

68142889 is a deficient number, since it is larger than the sum of its proper divisors (959831).

68142889 is an equidigital number, since it uses as much as digits as its factorization.

68142889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959830.

The product of its digits is 221184, while the sum is 46.

The square root of 68142889 is about 8254.8706228505. The cubic root of 68142889 is about 408.4512041040.

The spelling of 68142889 in words is "sixty-eight million, one hundred forty-two thousand, eight hundred eighty-nine".