68278865 has 4 divisors (see below), whose sum is σ = 81934644. Its totient is φ = 54623088.

The previous prime is 68278849. The next prime is 68278877. The reversal of 68278865 is 56887286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56887286 = 2 ⋅28443643.

It can be written as a sum of positive squares in 2 ways, for example, as 45535504 + 22743361 = 6748^2 + 4769^2 .

It is a cyclic number.

It is not a de Polignac number, because 68278865 - 2⁴ = 68278849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6827882 + ... + 6827891.

It is an arithmetic number, because the mean of its divisors is an integer number (20483661).

Almost surely, 2^68278865 is an apocalyptic number.

It is an amenable number.

68278865 is a deficient number, since it is larger than the sum of its proper divisors (13655779).

68278865 is a wasteful number, since it uses less digits than its factorization.

68278865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13655778.

The product of its digits is 1290240, while the sum is 50.

The square root of 68278865 is about 8263.1026255275. The cubic root of 68278865 is about 408.7227054567.

The spelling of 68278865 in words is "sixty-eight million, two hundred seventy-eight thousand, eight hundred sixty-five".