68278889 has 4 divisors (see below), whose sum is σ = 78033024. Its totient is φ = 58524756.

The previous prime is 68278879. The next prime is 68278897. The reversal of 68278889 is 98887286.

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 68278889 - 2⁸ = 68278633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68278849) 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, 4877057 + ... + 4877070.

It is an arithmetic number, because the mean of its divisors is an integer number (19508256).

Almost surely, 2^68278889 is an apocalyptic number.

It is an amenable number.

68278889 is a deficient number, since it is larger than the sum of its proper divisors (9754135).

68278889 is an equidigital number, since it uses as much as digits as its factorization.

68278889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9754134.

The product of its digits is 3096576, while the sum is 56.

The square root of 68278889 is about 8263.1040777664. The cubic root of 68278889 is about 408.7227533453.

The spelling of 68278889 in words is "sixty-eight million, two hundred seventy-eight thousand, eight hundred eighty-nine".