66672216 has 192 divisors, whose sum is σ = 214905600. Its totient is φ = 18475776.

The previous prime is 66672173. The next prime is 66672217. The reversal of 66672216 is 61227666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66672217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 408951 + ... + 409113.

It is an arithmetic number, because the mean of its divisors is an integer number (1119300).

Almost surely, 2^66672216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66672216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107452800).

66672216 is an abundant number, since it is smaller than the sum of its proper divisors (148233384).

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

66672216 is a wasteful number, since it uses less digits than its factorization.

66672216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 223 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 66672216 is about 8165.3056280828. The cubic root of 66672216 is about 405.4913834482.

The spelling of 66672216 in words is "sixty-six million, six hundred seventy-two thousand, two hundred sixteen".