67312985 has 8 divisors (see below), whose sum is σ = 81318600. Its totient is φ = 53488384.

The previous prime is 67312981. The next prime is 67313011. The reversal of 67312985 is 58921376.

It can be written as a sum of positive squares in 4 ways, for example, as 4713241 + 62599744 = 2171^2 + 7912^2 .

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 67312985 - 2² = 67312981 is a prime.

It is a super-2 number, since 2×67312985² = 9062075899220450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67312981) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 44432 + ... + 45921.

It is an arithmetic number, because the mean of its divisors is an integer number (10164825).

Almost surely, 2^67312985 is an apocalyptic number.

It is an amenable number.

67312985 is a deficient number, since it is larger than the sum of its proper divisors (14005615).

67312985 is a wasteful number, since it uses less digits than its factorization.

67312985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90507.

The product of its digits is 90720, while the sum is 41.

The square root of 67312985 is about 8204.4490978980. The cubic root of 67312985 is about 406.7862674138.

The spelling of 67312985 in words is "sixty-seven million, three hundred twelve thousand, nine hundred eighty-five".