133721648 has 10 divisors (see below), whose sum is σ = 259085724. Its totient is φ = 66860816.

The previous prime is 133721647. The next prime is 133721657. The reversal of 133721648 is 846127331.

It is not an unprimeable number, because it can be changed into a prime (133721647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4178786 + ... + 4178817.

Almost surely, 2^133721648 is an apocalyptic number.

It is an amenable number.

133721648 is a deficient number, since it is larger than the sum of its proper divisors (125364076).

133721648 is an equidigital number, since it uses as much as digits as its factorization.

133721648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8357611 (or 8357605 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 133721648 is about 11563.8076774045. The cubic root of 133721648 is about 511.3684228992.

Adding to 133721648 its reverse (846127331), we get a palindrome (979848979).

The spelling of 133721648 in words is "one hundred thirty-three million, seven hundred twenty-one thousand, six hundred forty-eight".