133216768 has 20 divisors (see below), whose sum is σ = 266174370. Its totient is φ = 66608128.

The previous prime is 133216763. The next prime is 133216789. The reversal of 133216768 is 867612331.

It can be written as a sum of positive squares in only one way, i.e., 105842944 + 27373824 = 10288^2 + 5232^2 .

It is not an unprimeable number, because it can be changed into a prime (133216763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129583 + ... + 130606.

Almost surely, 2^133216768 is an apocalyptic number.

It is an amenable number.

133216768 is a deficient number, since it is larger than the sum of its proper divisors (132957602).

133216768 is an frugal number, since it uses more digits than its factorization.

133216768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260207 (or 260191 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 133216768 is about 11541.9568531510. The cubic root of 133216768 is about 510.7240363330.

The spelling of 133216768 in words is "one hundred thirty-three million, two hundred sixteen thousand, seven hundred sixty-eight".