128649933 has 12 divisors (see below), whose sum is σ = 186516928. Its totient is φ = 85448520.

The previous prime is 128649901. The next prime is 128649943. The reversal of 128649933 is 339946821.

It is a happy number.

128649933 is a `hidden beast` number, since 128 + 6 + 499 + 33 = 666.

It is not a de Polignac number, because 128649933 - 2⁵ = 128649901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128649943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23935 + ... + 28812.

Almost surely, 2^128649933 is an apocalyptic number.

It is an amenable number.

128649933 is a deficient number, since it is larger than the sum of its proper divisors (57866995).

128649933 is a wasteful number, since it uses less digits than its factorization.

128649933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53024 (or 53021 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 128649933 is about 11342.3953819288. The cubic root of 128649933 is about 504.8199639253.

The spelling of 128649933 in words is "one hundred twenty-eight million, six hundred forty-nine thousand, nine hundred thirty-three".