135021640 has 32 divisors (see below), whose sum is σ = 327169080. Its totient is φ = 49853952.

The previous prime is 135021629. The next prime is 135021673. The reversal of 135021640 is 46120531.

It can be written as a sum of positive squares in 4 ways, for example, as 122190916 + 12830724 = 11054^2 + 3582^2 .

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 7 ways as a sum of consecutive naturals, for example, 129309 + ... + 130348.

Almost surely, 2^135021640 is an apocalyptic number.

135021640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135021640 is an abundant number, since it is smaller than the sum of its proper divisors (192147440).

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

135021640 is a wasteful number, since it uses less digits than its factorization.

135021640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259681 (or 259677 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 135021640 is about 11619.8812386358. The cubic root of 135021640 is about 513.0201928197.

The spelling of 135021640 in words is "one hundred thirty-five million, twenty-one thousand, six hundred forty".