133778890 has 64 divisors (see below), whose sum is σ = 283855104. Its totient is φ = 44448768.

The previous prime is 133778849. The next prime is 133778921. The reversal of 133778890 is 98877331.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 133778890.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396802 + ... + 397138.

It is an arithmetic number, because the mean of its divisors is an integer number (4435236).

Almost surely, 2^133778890 is an apocalyptic number.

133778890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133778890 is an abundant number, since it is smaller than the sum of its proper divisors (150076214).

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

133778890 is a wasteful number, since it uses less digits than its factorization.

133778890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 133778890 is about 11566.2824623991. The cubic root of 133778890 is about 511.4413793624.

The spelling of 133778890 in words is "one hundred thirty-three million, seven hundred seventy-eight thousand, eight hundred ninety".