67421218 has 32 divisors (see below), whose sum is σ = 112969728. Its totient is φ = 30028800.

The previous prime is 67421213. The next prime is 67421219. The reversal of 67421218 is 81212476.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 67421218.

It is not an unprimeable number, because it can be changed into a prime (67421213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48858 + ... + 50218.

It is an arithmetic number, because the mean of its divisors is an integer number (3530304).

Almost surely, 2^67421218 is an apocalyptic number.

67421218 is a deficient number, since it is larger than the sum of its proper divisors (45548510).

67421218 is a wasteful number, since it uses less digits than its factorization.

67421218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458.

The product of its digits is 5376, while the sum is 31.

The square root of 67421218 is about 8211.0424429545. The cubic root of 67421218 is about 407.0041754527.

The spelling of 67421218 in words is "sixty-seven million, four hundred twenty-one thousand, two hundred eighteen".