133891268 has 12 divisors (see below), whose sum is σ = 267782592. Its totient is φ = 57381960.

The previous prime is 133891267. The next prime is 133891283. The reversal of 133891268 is 862198331.

133891268 is an admirable number.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (133891267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2390888 + ... + 2390943.

It is an arithmetic number, because the mean of its divisors is an integer number (22315216).

Almost surely, 2^133891268 is an apocalyptic number.

It is an amenable number.

133891268 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

133891268 is a wasteful number, since it uses less digits than its factorization.

133891268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4781842 (or 4781840 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 133891268 is about 11571.1394425960. The cubic root of 133891268 is about 511.5845476240.

The spelling of 133891268 in words is "one hundred thirty-three million, eight hundred ninety-one thousand, two hundred sixty-eight".