133678649 has 8 divisors (see below), whose sum is σ = 144359040. Its totient is φ = 123055056.

The previous prime is 133678591. The next prime is 133678673. The reversal of 133678649 is 946876331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133678649 - 2⁸ = 133678393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133678049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9239 + ... + 18780.

It is an arithmetic number, because the mean of its divisors is an integer number (18044880).

Almost surely, 2^133678649 is an apocalyptic number.

It is an amenable number.

133678649 is a deficient number, since it is larger than the sum of its proper divisors (10680391).

133678649 is a wasteful number, since it uses less digits than its factorization.

133678649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28399.

The product of its digits is 653184, while the sum is 47.

The square root of 133678649 is about 11561.9483219741. The cubic root of 133678649 is about 511.3136058261.

The spelling of 133678649 in words is "one hundred thirty-three million, six hundred seventy-eight thousand, six hundred forty-nine".