135991648 has 24 divisors (see below), whose sum is σ = 288329328. Its totient is φ = 62765184.

The previous prime is 135991601. The next prime is 135991649. The reversal of 135991648 is 846199531.

It is a junction number, because it is equal to n+sod(n) for n = 135991598 and 135991607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135991649) 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, 163036 + ... + 163867.

It is an arithmetic number, because the mean of its divisors is an integer number (12013722).

Almost surely, 2^135991648 is an apocalyptic number.

It is an amenable number.

135991648 is an abundant number, since it is smaller than the sum of its proper divisors (152337680).

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

135991648 is a wasteful number, since it uses less digits than its factorization.

135991648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326926 (or 326918 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 135991648 is about 11661.5456951469. The cubic root of 135991648 is about 514.2457907868.

The spelling of 135991648 in words is "one hundred thirty-five million, nine hundred ninety-one thousand, six hundred forty-eight".