133178668 has 42 divisors (see below), whose sum is σ = 272866916. Its totient is φ = 56874888.

The previous prime is 133178641. The next prime is 133178681. The reversal of 133178668 is 866871331.

It is a super-2 number, since 2×133178668² = 35473115220508448, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 470455 + ... + 470737.

Almost surely, 2^133178668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133178668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136433458).

133178668 is an abundant number, since it is smaller than the sum of its proper divisors (139688248).

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

133178668 is an frugal number, since it uses more digits than its factorization.

133178668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 292 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 133178668 is about 11540.3062351049. The cubic root of 133178668 is about 510.6753426602.

The spelling of 133178668 in words is "one hundred thirty-three million, one hundred seventy-eight thousand, six hundred sixty-eight".