135221658 has 64 divisors (see below), whose sum is σ = 319334400. Its totient is φ = 37632960.

The previous prime is 135221633. The next prime is 135221677. The reversal of 135221658 is 856122531.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307803 + ... + 308241.

It is an arithmetic number, because the mean of its divisors is an integer number (4989600).

Almost surely, 2^135221658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135221658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159667200).

135221658 is an abundant number, since it is smaller than the sum of its proper divisors (184112742).

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

135221658 is a wasteful number, since it uses less digits than its factorization.

135221658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827.

The product of its digits is 14400, while the sum is 33.

The square root of 135221658 is about 11628.4847680169. The cubic root of 135221658 is about 513.2733933311.

The spelling of 135221658 in words is "one hundred thirty-five million, two hundred twenty-one thousand, six hundred fifty-eight".