67217243920 has 80 divisors (see below), whose sum is σ = 164563663680. Its totient is φ = 25462771200.

The previous prime is 67217243843. The next prime is 67217243957. The reversal of 67217243920 is 2934271276.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5604330 + ... + 5616310.

It is an arithmetic number, because the mean of its divisors is an integer number (2057045796).

Almost surely, 2^67217243920 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 67217243920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82281831840).

67217243920 is an abundant number, since it is smaller than the sum of its proper divisors (97346419760).

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

67217243920 is a wasteful number, since it uses less digits than its factorization.

67217243920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15704 (or 15698 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 43.

The spelling of 67217243920 in words is "sixty-seven billion, two hundred seventeen million, two hundred forty-three thousand, nine hundred twenty".