67281745 has 4 divisors (see below), whose sum is σ = 80738100. Its totient is φ = 53825392.

The previous prime is 67281737. The next prime is 67281757. The reversal of 67281745 is 54718276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47004736 + 20277009 = 6856^2 + 4503^2 .

It is a cyclic number.

It is not a de Polignac number, because 67281745 - 2³ = 67281737 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 67281698 and 67281707.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6728170 + ... + 6728179.

It is an arithmetic number, because the mean of its divisors is an integer number (20184525).

Almost surely, 2^67281745 is an apocalyptic number.

It is an amenable number.

67281745 is a deficient number, since it is larger than the sum of its proper divisors (13456355).

67281745 is a wasteful number, since it uses less digits than its factorization.

67281745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13456354.

The product of its digits is 94080, while the sum is 40.

The square root of 67281745 is about 8202.5450318788. The cubic root of 67281745 is about 406.7233277525.

The spelling of 67281745 in words is "sixty-seven million, two hundred eighty-one thousand, seven hundred forty-five".