68445889 has 4 divisors (see below), whose sum is σ = 68550100. Its totient is φ = 68341680.

The previous prime is 68445857. The next prime is 68445899. The reversal of 68445889 is 98854486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98854486 = 2 ⋅49427243.

It can be written as a sum of positive squares in 2 ways, for example, as 37454400 + 30991489 = 6120^2 + 5567^2 .

It is a cyclic number.

It is not a de Polignac number, because 68445889 - 2⁵ = 68445857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68445899) 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, 51114 + ... + 52435.

It is an arithmetic number, because the mean of its divisors is an integer number (17137525).

Almost surely, 2^68445889 is an apocalyptic number.

It is an amenable number.

68445889 is a deficient number, since it is larger than the sum of its proper divisors (104211).

68445889 is a wasteful number, since it uses less digits than its factorization.

68445889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104210.

The product of its digits is 2211840, while the sum is 52.

The square root of 68445889 is about 8273.2030677362. The cubic root of 68445889 is about 409.0557070480.

The spelling of 68445889 in words is "sixty-eight million, four hundred forty-five thousand, eight hundred eighty-nine".