68242891 has 4 divisors (see below), whose sum is σ = 68290272. Its totient is φ = 68195512.

The previous prime is 68242843. The next prime is 68242897. The reversal of 68242891 is 19824286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19824286 = 2 ⋅9912143.

It is a cyclic number.

It is not a de Polignac number, because 68242891 - 2¹⁵ = 68210123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68242897) 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, 21460 + ... + 24433.

It is an arithmetic number, because the mean of its divisors is an integer number (17072568).

Almost surely, 2^68242891 is an apocalyptic number.

68242891 is a deficient number, since it is larger than the sum of its proper divisors (47381).

68242891 is a wasteful number, since it uses less digits than its factorization.

68242891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47380.

The product of its digits is 55296, while the sum is 40.

The square root of 68242891 is about 8260.9255534716. The cubic root of 68242891 is about 408.6509117735.

The spelling of 68242891 in words is "sixty-eight million, two hundred forty-two thousand, eight hundred ninety-one".