133721268 has 24 divisors (see below), whose sum is σ = 312211872. Its totient is φ = 44545824.

The previous prime is 133721267. The next prime is 133721299. The reversal of 133721268 is 862127331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133721267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27346 + ... + 31862.

It is an arithmetic number, because the mean of its divisors is an integer number (13008828).

Almost surely, 2^133721268 is an apocalyptic number.

It is an amenable number.

133721268 is an abundant number, since it is smaller than the sum of its proper divisors (178490604).

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

133721268 is a wasteful number, since it uses less digits than its factorization.

133721268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6991 (or 6989 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 133721268 is about 11563.7912468187. The cubic root of 133721268 is about 511.3679385094.

Adding to 133721268 its reverse (862127331), we get a palindrome (995848599).

The spelling of 133721268 in words is "one hundred thirty-three million, seven hundred twenty-one thousand, two hundred sixty-eight".