133565890 has 8 divisors (see below), whose sum is σ = 240418620. Its totient is φ = 53426352.

The previous prime is 133565879. The next prime is 133565891. The reversal of 133565890 is 98565331.

It can be written as a sum of positive squares in 2 ways, for example, as 132457081 + 1108809 = 11509^2 + 1053^2 .

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

It is not an unprimeable number, because it can be changed into a prime (133565891) 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, 6678285 + ... + 6678304.

Almost surely, 2^133565890 is an apocalyptic number.

133565890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133565890 is a deficient number, since it is larger than the sum of its proper divisors (106852730).

133565890 is a wasteful number, since it uses less digits than its factorization.

133565890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13356596.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 133565890 is about 11557.0709957151. The cubic root of 133565890 is about 511.1697996915.

The spelling of 133565890 in words is "one hundred thirty-three million, five hundred sixty-five thousand, eight hundred ninety".