66789216 has 72 divisors (see below), whose sum is σ = 204553440. Its totient is φ = 20549376.

The previous prime is 66789197. The next prime is 66789223. The reversal of 66789216 is 61298766.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5176 + ... + 12663.

It is an arithmetic number, because the mean of its divisors is an integer number (2841020).

Almost surely, 2^66789216 is an apocalyptic number.

It is an amenable number.

66789216 is an abundant number, since it is smaller than the sum of its proper divisors (137764224).

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

66789216 is a wasteful number, since it uses less digits than its factorization.

66789216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17868 (or 17857 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 66789216 is about 8172.4669470118. The cubic root of 66789216 is about 405.7284375525.

The spelling of 66789216 in words is "sixty-six million, seven hundred eighty-nine thousand, two hundred sixteen".