133728617 has 4 divisors (see below), whose sum is σ = 145885776. Its totient is φ = 121571460.

The previous prime is 133728611. The next prime is 133728629. The reversal of 133728617 is 716827331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133728617 is a prime.

It is a super-3 number, since 3×133728617³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133728611) 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, 6078563 + ... + 6078584.

It is an arithmetic number, because the mean of its divisors is an integer number (36471444).

Almost surely, 2^133728617 is an apocalyptic number.

It is an amenable number.

133728617 is a deficient number, since it is larger than the sum of its proper divisors (12157159).

133728617 is a wasteful number, since it uses less digits than its factorization.

133728617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12157158.

The product of its digits is 42336, while the sum is 38.

The square root of 133728617 is about 11564.1090015617. The cubic root of 133728617 is about 511.3773061894.

The spelling of 133728617 in words is "one hundred thirty-three million, seven hundred twenty-eight thousand, six hundred seventeen".