67944865 has 4 divisors (see below), whose sum is σ = 81533844. Its totient is φ = 54355888.

The previous prime is 67944847. The next prime is 67944871. The reversal of 67944865 is 56844976.

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 50296464 + 17648401 = 7092^2 + 4201^2 .

It is a cyclic number.

It is not a de Polignac number, because 67944865 - 2⁹ = 67944353 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 6794482 + ... + 6794491.

It is an arithmetic number, because the mean of its divisors is an integer number (20383461).

Almost surely, 2^67944865 is an apocalyptic number.

It is an amenable number.

67944865 is a deficient number, since it is larger than the sum of its proper divisors (13588979).

67944865 is a wasteful number, since it uses less digits than its factorization.

67944865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13588978.

The product of its digits is 1451520, while the sum is 49.

The square root of 67944865 is about 8242.8675228952. The cubic root of 67944865 is about 408.0551656312.

The spelling of 67944865 in words is "sixty-seven million, nine hundred forty-four thousand, eight hundred sixty-five".