135216408 has 32 divisors (see below), whose sum is σ = 338506560. Its totient is φ = 45010080.

The previous prime is 135216383. The next prime is 135216413. The reversal of 135216408 is 804612531.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15991 + ... + 22937.

It is an arithmetic number, because the mean of its divisors is an integer number (10578330).

Almost surely, 2^135216408 is an apocalyptic number.

It is an amenable number.

135216408 is an abundant number, since it is smaller than the sum of its proper divisors (203290152).

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

135216408 is a wasteful number, since it uses less digits than its factorization.

135216408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7767 (or 7763 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 135216408 is about 11628.2590270427. The cubic root of 135216408 is about 513.2667506078.

Adding to 135216408 its reverse (804612531), we get a palindrome (939828939).

The spelling of 135216408 in words is "one hundred thirty-five million, two hundred sixteen thousand, four hundred eight".