67218642 has 24 divisors (see below), whose sum is σ = 145928016. Its totient is φ = 22361976.

The previous prime is 67218587. The next prime is 67218643. The reversal of 67218642 is 24681276.

67218642 is a `hidden beast` number, since 6 + 7 + 2 + 1 + 8 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 67218597 and 67218606.

It is not an unprimeable number, because it can be changed into a prime (67218643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6433 + ... + 13259.

It is an arithmetic number, because the mean of its divisors is an integer number (6080334).

Almost surely, 2^67218642 is an apocalyptic number.

67218642 is an abundant number, since it is smaller than the sum of its proper divisors (78709374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67218642 is a wasteful number, since it uses less digits than its factorization.

67218642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7382 (or 7379 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 67218642 is about 8198.6975794940. The cubic root of 67218642 is about 406.5961338153.

The spelling of 67218642 in words is "sixty-seven million, two hundred eighteen thousand, six hundred forty-two".