135621568 has 14 divisors (see below), whose sum is σ = 269124176. Its totient is φ = 67810752.

The previous prime is 135621557. The next prime is 135621581. The reversal of 135621568 is 865126531.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1059480 + ... + 1059607.

Almost surely, 2^135621568 is an apocalyptic number.

It is an amenable number.

135621568 is a deficient number, since it is larger than the sum of its proper divisors (133502608).

135621568 is an equidigital number, since it uses as much as digits as its factorization.

135621568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119099 (or 2119089 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 135621568 is about 11645.6673488470. The cubic root of 135621568 is about 513.7788871659.

The spelling of 135621568 in words is "one hundred thirty-five million, six hundred twenty-one thousand, five hundred sixty-eight".