128723433 has 16 divisors (see below), whose sum is σ = 180182016. Its totient is φ = 81585680.

The previous prime is 128723417. The next prime is 128723437. The reversal of 128723433 is 334327821.

It is a cyclic number.

It is not a de Polignac number, because 128723433 - 2⁴ = 128723417 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128723394 and 128723403.

It is not an unprimeable number, because it can be changed into a prime (128723437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5938 + ... + 17108.

It is an arithmetic number, because the mean of its divisors is an integer number (11261376).

Almost surely, 2^128723433 is an apocalyptic number.

It is an amenable number.

128723433 is a deficient number, since it is larger than the sum of its proper divisors (51458583).

128723433 is a wasteful number, since it uses less digits than its factorization.

128723433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11364.

The product of its digits is 24192, while the sum is 33.

The square root of 128723433 is about 11345.6349756195. The cubic root of 128723433 is about 504.9160831708.

The spelling of 128723433 in words is "one hundred twenty-eight million, seven hundred twenty-three thousand, four hundred thirty-three".