133355778 has 8 divisors (see below), whose sum is σ = 266711568. Its totient is φ = 44451924.

The previous prime is 133355777. The next prime is 133355797. The reversal of 133355778 is 877553331.

133355778 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

133355778 is an admirable number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (133355777) 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, 11112976 + ... + 11112987.

It is an arithmetic number, because the mean of its divisors is an integer number (33338946).

Almost surely, 2^133355778 is an apocalyptic number.

133355778 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.

133355778 is a wasteful number, since it uses less digits than its factorization.

133355778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22225968.

The product of its digits is 264600, while the sum is 42.

The square root of 133355778 is about 11547.9772254711. The cubic root of 133355778 is about 510.9016192536.

Adding to 133355778 its product of digits (264600), we get a triangular number (133620378 = T₁₆₃₄₇).

The spelling of 133355778 in words is "one hundred thirty-three million, three hundred fifty-five thousand, seven hundred seventy-eight".