133811868 has 12 divisors (see below), whose sum is σ = 312227720. Its totient is φ = 44603952.

The previous prime is 133811863. The next prime is 133811891. The reversal of 133811868 is 868118331.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133811863) 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, 5575483 + ... + 5575506.

Almost surely, 2^133811868 is an apocalyptic number.

It is an amenable number.

133811868 is an abundant number, since it is smaller than the sum of its proper divisors (178415852).

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

133811868 is a wasteful number, since it uses less digits than its factorization.

133811868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11150996 (or 11150994 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 133811868 is about 11567.7079838661. The cubic root of 133811868 is about 511.4834012591.

The spelling of 133811868 in words is "one hundred thirty-three million, eight hundred eleven thousand, eight hundred sixty-eight".