135281668 has 12 divisors (see below), whose sum is σ = 236884032. Its totient is φ = 67600520.

The previous prime is 135281639. The next prime is 135281681. The reversal of 135281668 is 866182531.

It is a super-2 number, since 2×135281668² = 36602259393724448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 135281668.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768 + ... + 16543.

It is an arithmetic number, because the mean of its divisors is an integer number (19740336).

Almost surely, 2^135281668 is an apocalyptic number.

It is an amenable number.

135281668 is a deficient number, since it is larger than the sum of its proper divisors (101602364).

135281668 is a wasteful number, since it uses less digits than its factorization.

135281668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20162 (or 20160 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 135281668 is about 11631.0647835871. The cubic root of 135281668 is about 513.3493106101.

The spelling of 135281668 in words is "one hundred thirty-five million, two hundred eighty-one thousand, six hundred sixty-eight".