67213145 has 8 divisors (see below), whose sum is σ = 82623240. Its totient is φ = 52458880.

The previous prime is 67213141. The next prime is 67213187. The reversal of 67213145 is 54131276.

It can be written as a sum of positive squares in 4 ways, for example, as 4787344 + 62425801 = 2188^2 + 7901^2 .

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

It is not a de Polignac number, because 67213145 - 2² = 67213141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67213141) 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, 163730 + ... + 164139.

It is an arithmetic number, because the mean of its divisors is an integer number (10327905).

Almost surely, 2^67213145 is an apocalyptic number.

It is an amenable number.

67213145 is a deficient number, since it is larger than the sum of its proper divisors (15410095).

67213145 is a wasteful number, since it uses less digits than its factorization.

67213145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327915.

The product of its digits is 5040, while the sum is 29.

The square root of 67213145 is about 8198.3623364670. The cubic root of 67213145 is about 406.5850499860.

The spelling of 67213145 in words is "sixty-seven million, two hundred thirteen thousand, one hundred forty-five".