67216784 has 20 divisors (see below), whose sum is σ = 130598784. Its totient is φ = 33513888.

The previous prime is 67216781. The next prime is 67216789. The reversal of 67216784 is 48761276.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (67216781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149 + ... + 11595.

Almost surely, 2^67216784 is an apocalyptic number.

It is an amenable number.

67216784 is a deficient number, since it is larger than the sum of its proper divisors (63382000).

67216784 is a wasteful number, since it uses less digits than its factorization.

67216784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11822 (or 11816 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 67216784 is about 8198.5842680307. The cubic root of 67216784 is about 406.5923875204.

The spelling of 67216784 in words is "sixty-seven million, two hundred sixteen thousand, seven hundred eighty-four".