135533220 has 48 divisors (see below), whose sum is σ = 389755968. Its totient is φ = 35164800.

The previous prime is 135533191. The next prime is 135533263. The reversal of 135533220 is 22335531.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28306 + ... + 32745.

It is an arithmetic number, because the mean of its divisors is an integer number (8119916).

Almost surely, 2^135533220 is an apocalyptic number.

135533220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135533220 is an abundant number, since it is smaller than the sum of its proper divisors (254222748).

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

135533220 is a wasteful number, since it uses less digits than its factorization.

135533220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61100 (or 61098 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 135533220 is about 11641.8735605572. The cubic root of 135533220 is about 513.6672992187.

Adding to 135533220 its reverse (22335531), we get a palindrome (157868751).

The spelling of 135533220 in words is "one hundred thirty-five million, five hundred thirty-three thousand, two hundred twenty".