68218145 has 8 divisors (see below), whose sum is σ = 82278504. Its totient is φ = 54296704.

The previous prime is 68218123. The next prime is 68218169. The reversal of 68218145 is 54181286.

It can be written as a sum of positive squares in 4 ways, for example, as 35236096 + 32982049 = 5936^2 + 5743^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68218145 - 2²⁶ = 1109281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33644 + ... + 35613.

It is an arithmetic number, because the mean of its divisors is an integer number (10284813).

Almost surely, 2^68218145 is an apocalyptic number.

It is an amenable number.

68218145 is a deficient number, since it is larger than the sum of its proper divisors (14060359).

68218145 is a wasteful number, since it uses less digits than its factorization.

68218145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69459.

The product of its digits is 15360, while the sum is 35.

The square root of 68218145 is about 8259.4276436082. The cubic root of 68218145 is about 408.6015112773.

The spelling of 68218145 in words is "sixty-eight million, two hundred eighteen thousand, one hundred forty-five".