135989728 has 24 divisors (see below), whose sum is σ = 305977392. Its totient is φ = 58281216.

The previous prime is 135989723. The next prime is 135989741. The reversal of 135989728 is 827989531.

It is a super-2 number, since 2×135989728² = 36986412243027968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135989723) 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, 303325 + ... + 303772.

It is an arithmetic number, because the mean of its divisors is an integer number (12749058).

Almost surely, 2^135989728 is an apocalyptic number.

It is an amenable number.

135989728 is an abundant number, since it is smaller than the sum of its proper divisors (169987664).

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

135989728 is an equidigital number, since it uses as much as digits as its factorization.

135989728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607114 (or 607106 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 52.

The square root of 135989728 is about 11661.4633730077. The cubic root of 135989728 is about 514.2433706466.

The spelling of 135989728 in words is "one hundred thirty-five million, nine hundred eighty-nine thousand, seven hundred twenty-eight".